BLOOD RELATIONS

 

Blood Relations: Complete Notes

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What is Blood Relation?

Blood Relation problems deal with the relationships between different family members based on their blood connections (family ties). These questions test logical reasoning skills by analyzing how people are related to each other.

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Common Terms in Blood Relations

Term	Meaning/Definition
Father	Male parent
Mother	Female parent
Son	Male child
Daughter	Female child
Brother	Male sibling
Sister	Female sibling
Uncle	Father’s or mother’s brother
Aunt	Father’s or mother’s sister
Nephew	Son of brother or sister
Niece	Daughter of brother or sister
Cousin	Child of uncle or aunt
Grandfather	Father of father/mother
Grandmother	Mother of father/mother
Husband	Male spouse
Wife	Female spouse

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Types of Blood Relation Questions

1. Direct Relation:
   One person directly related to another (e.g., A is B’s father).
2. Indirect Relation:
   Relationship is given through a series of connections (e.g., A is the son of B who is the brother of C).
3. Gender Based:
   Sometimes gender is not mentioned, and must be deduced from context.
4. Family Tree:
   Constructing family trees based on the information provided.

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Commonly Used Symbols

Symbol	Meaning
M	Male
F	Female
H	Husband
W	Wife
S	Son
D	Daughter
B	Brother
S (or Sis)	Sister
GF	Grandfather
GM	Grandmother

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Key Points to Remember

• Father, Mother, Son, Daughter, Brother, Sister are direct relations.
• Uncle/Aunt can be father’s or mother’s siblings.
• Nephew/Niece are children of siblings.
• Cousins share grandparents but are not siblings.
• Use the process of elimination and deduction to find missing relations.
• Sometimes the question might be in a coded form (e.g., ‘A is the son of B’s father’).

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Examples

Example 1:
A is the father of B. B is the brother of C. How is C related to A?
Answer: C is the child of A (son or daughter).

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Example 2:
A is the son of B. C is the father of B. How is C related to A?
Answer: C is A’s grandfather.

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Example 3:
X is the mother of Y. Y is the father of Z. How is X related to Z?
Answer: X is Z’s grandmother.

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Solving Tips

• Draw the family tree if possible.
• Carefully track the gender from the statement.
• Look for keywords: father, mother, son, daughter, brother, sister.
• Check the relationship from both directions.
• Practice makes perfect!

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100 Practice Questions on Blood Relations

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Q1 - Q20: Basic Direct Relations

1. A is the father of B. How is B related to A?
2. B is the daughter of C. How is C related to B?
3. X is the brother of Y. How is Y related to X?
4. A is the mother of B. B is the son of C. How is A related to C?
5. M is the husband of N. How is N related to M?
6. P is the son of Q. Q is the sister of R. How is R related to P?
7. A is the father of B and C. How are B and C related?
8. X is the mother of Y. Y is the sister of Z. How is X related to Z?
9. A is the daughter of B. C is the father of B. How is C related to A?
10. X is the father of Y. Y is the father of Z. How is X related to Z?

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Q21 - Q40: Intermediate Relations

11. A is the brother of B. B is the sister of C. How is A related to C?
12. P is the uncle of Q. How is Q related to P?
13. M is the nephew of N. How is N related to M?
14. A is the son of B. C is the daughter of B. How are A and C related?
15. X is the father of Y. Y is the brother of Z. Z is the father of W. How is X related to W?
16. A is the father of B. B is the father of C. C is the mother of D. How is A related to D?
17. M is the sister of N. N is the wife of O. How is M related to O?
18. P is the daughter of Q. R is the son of Q. How are P and R related?
19. X is the uncle of Y. Y is the son of Z. How is Z related to X?
20. A is the daughter of B. B is the son of C. How is A related to C?

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Q41 - Q60: Advanced Multi-Step Relations

21. A is the son of B. B is the brother of C. D is the daughter of C. How is A related to D?
22. X is the father of Y. Y is the mother of Z. How is X related to Z?
23. P is the brother of Q. Q is the sister of R. R is the father of S. How is P related to S?
24. A is the mother of B. B is the father of C. How is A related to C?
25. M is the husband of N. N is the sister of O. How is M related to O?
26. X is the grandfather of Y. Y is the father of Z. How is X related to Z?
27. A is the daughter of B. B is the sister of C. How is A related to C?
28. P is the son of Q. Q is the wife of R. How is P related to R?
29. X is the father of Y. Y is the uncle of Z. How is X related to Z?
30. A is the mother of B. B is the sister of C. C is the daughter of D. How is A related to D?

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Q61 - Q80: Complex Blood Relation Questions

31. A is the son of B. B is the mother of C. C is the brother of D. How is A related to D?
32. X is the father of Y. Y is the son of Z. How is X related to Z?
33. M is the brother of N. N is the sister of O. O is the father of P. How is M related to P?
34. A is the mother of B. B is the daughter of C. How is A related to C?
35. P is the husband of Q. Q is the daughter of R. How is P related to R?
36. X is the grandfather of Y. Y is the mother of Z. How is X related to Z?
37. A is the son of B. B is the sister of C. C is the father of D. How is A related to D?
38. P is the daughter of Q. Q is the wife of R. How is P related to R?
39. X is the father of Y. Y is the nephew of Z. How is X related to Z?
40. A is the mother of B. B is the sister of C. C is the son of D. How is A related to D?

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Q81 - Q100: Puzzle Style Blood Relations

41. Pointing to a man, a woman said, "He is the son of my grandfather’s only son." How is the man related to the woman?
42. A says, "B is the son of my father’s only daughter." How is B related to A?
43. C is the brother of D. E is the sister of D. How is E related to C?
44. A’s mother is the only daughter of B. How is B related to A?
45. P is the son of Q. R is the brother of Q. How is R related to P?
46. A is the father of B. B is the father of C. D is the brother of C. How is A related to D?
47. Pointing to a woman, a man said, "She is the daughter of my father’s only son." How is the woman related to the man?
48. A is the sister of B. B is the mother of C. How is A related to C?
49. X is the son of Y. Y is the mother of Z. How is X related to Z?
50. A’s father is B. C is the son of B. How is C related to A?

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Answers and Explanations

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Q1 - Q20

1. Son/Daughter
2. Mother/Father
3. Sister/Brother
4. Wife of C
5. Wife
6. Uncle
7. Siblings
8. Mother
9. Grandfather
10. Grandfather

Q11 - Q20

11. Brother
12. Nephew/Niece
13. Uncle/Aunt
14. Siblings
15. Grandfather
16. Great-grandfather
17. Sister-in-law
18. Siblings
19. Parent
20. Grandparent

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Q21 - Q30

21. Cousins
22. Grandfather
23. Uncle
24. Grandmother
25. Brother-in-law
26. Great-grandfather
27. Aunt
28. Son
29. Grandfather
30. Daughter-in-law

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Q31 - Q40

31. Cousin
32. Father-in-law
33. Uncle
34. Mother-in-law
35. Son-in-law
36. Great-grandfather
37. Cousin
38. Daughter
39. Father
40. Daughter-in-law

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Q41 - Q50

41. Brother
42. Sister
43. Sister
44. Grandmother
45. Uncle
46. Grandfather
47. Sister
48. Aunt
49. Brother
50. Brother

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Detailed Explanation of Sample Questions

Q41:
"Pointing to a man, a woman said, ‘He is the son of my grandfather’s only son.’"

• Grandfather’s only son = Woman’s father
• Son of Woman’s father = Woman’s brother
  Answer: Brother

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Q42:
"A says, ‘B is the son of my father’s only daughter.’"

• Father’s only daughter = A’s sister (if A is male) or A herself (if A is female)
• Son of A’s sister = Nephew
  Answer: Nephew

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Blood Relations: Practice Questions 51 to 100

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Q51 - Q60: More Puzzle Style

51. A is the father of B. B is the mother of C. How is A related to C?
52. X is the son of Y. Y is the daughter of Z. How is Z related to X?
53. P is the brother of Q. Q is the son of R. How is P related to R?
54. A is the husband of B. B is the daughter of C. How is A related to C?
55. M is the son of N. N is the sister of O. How is M related to O?
56. X is the daughter of Y. Y is the wife of Z. How is X related to Z?
57. A is the father of B. C is the brother of B. How is A related to C?
58. P is the sister of Q. Q is the wife of R. How is P related to R?
59. X is the grandfather of Y. Y is the father of Z. How is X related to Z?
60. A is the mother of B. B is the sister of C. How is A related to C?

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Q61 - Q70: Relation Chains

61. A is the son of B. B is the brother of C. D is the daughter of C. How is A related to D?
62. X is the father of Y. Y is the uncle of Z. How is X related to Z?
63. P is the mother of Q. Q is the sister of R. How is P related to R?
64. A is the daughter of B. B is the sister of C. How is A related to C?
65. M is the father of N. N is the husband of O. How is M related to O?
66. X is the brother of Y. Y is the father of Z. How is X related to Z?
67. A is the grandfather of B. B is the father of C. How is A related to C?
68. P is the sister of Q. Q is the daughter of R. How is P related to R?
69. X is the son of Y. Y is the daughter of Z. How is Z related to X?
70. A is the brother of B. B is the husband of C. How is A related to C?

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Q71 - Q80: Mixed Complexity

71. A is the wife of B. B is the son of C. How is A related to C?
72. X is the daughter of Y. Y is the brother of Z. How is X related to Z?
73. P is the father of Q. Q is the father of R. How is P related to R?
74. A is the mother of B. B is the brother of C. How is A related to C?
75. M is the husband of N. N is the daughter of O. How is M related to O?
76. X is the father of Y. Y is the mother of Z. How is X related to Z?
77. A is the brother of B. B is the father of C. How is A related to C?
78. P is the sister of Q. Q is the mother of R. How is P related to R?
79. X is the son of Y. Y is the wife of Z. How is X related to Z?
80. A is the father of B. B is the uncle of C. How is A related to C?

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Q81 - Q90: Relationship Puzzles

81. Pointing to a boy, a girl said, "He is the son of my mother’s only brother." How is the boy related to the girl?
82. A says, "B is the son of my father’s only daughter." How is B related to A?
83. C is the sister of D. E is the brother of D. How is E related to C?
84. A’s mother is the only daughter of B. How is B related to A?
85. P is the son of Q. R is the brother of Q. How is R related to P?
86. A is the father of B. B is the father of C. D is the sister of C. How is A related to D?
87. Pointing to a woman, a man said, "She is the daughter of my father’s only son." How is the woman related to the man?
88. A is the sister of B. B is the mother of C. How is A related to C?
89. X is the son of Y. Y is the mother of Z. How is X related to Z?
90. A’s father is B. C is the son of B. How is C related to A?

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Q91 - Q100: Advanced Blood Relation Puzzles

91. A says, "B is the son of my mother’s father." How is B related to A?
92. X is the sister of Y. Y is the mother of Z. How is X related to Z?
93. M is the uncle of N. N is the son of O. How is O related to M?
94. A is the daughter of B. C is the father of B. How is C related to A?
95. P is the father of Q. R is the son of P. How is Q related to R?
96. X is the father of Y. Y is the brother of Z. Z is the father of W. How is X related to W?
97. A is the mother of B. B is the uncle of C. How is A related to C?
98. M is the daughter of N. O is the son of N. How are M and O related?
99. X is the father of Y. Y is the son of Z. How is X related to Z?
100. A is the husband of B. B is the sister of C. How is A related to C?

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Answers and Explanations: Questions 51 - 100

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51. Grandfather (A is father of B, who is mother of C)
52. Grandmother (Z is mother of Y, who is father of X)
53. Uncle (P is brother of Q, who is son of R)
54. Son-in-law (A is husband of B, B is daughter of C)
55. Nephew (M is son of N, sister of O)
56. Father (Y is wife of Z, X is daughter of Y)
57. Father (A is father of B and brother of C)
58. Sister-in-law (P is sister of Q, wife of R)
59. Great-grandfather (X grandfather of Y, father of Z)
60. Mother (A mother of B and sister of C)

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61. Cousins (A and D are children of siblings B and C)
62. Grandfather (X father of Y uncle of Z)
63. Mother (P is mother of Q and sister of R)
64. Aunt (A daughter of B, sister of C)
65. Father-in-law (M father of N, husband of O)
66. Uncle (X brother of Y, father of Z)
67. Great-grandfather (A grandfather of B, father of C)
68. Aunt (P sister of Q, daughter of R)
69. Grandmother (Z mother of Y, grandmother of X)
70. Brother-in-law (A brother of B, husband of C)

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71. Daughter-in-law (A wife of B son of C)
72. Niece (X daughter of Y, brother of Z)
73. Grandfather (P father of Q, father of R)
74. Mother (A mother of B, brother of C)
75. Son-in-law (M husband of N daughter of O)
76. Grandfather (X father of Y mother of Z)
77. Uncle (A brother of B, father of C)
78. Aunt (P sister of Q mother of R)
79. Son (X son of Y wife of Z)
80. Grandfather (A father of B uncle of C)

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81. Cousin (son of mother’s brother)
82. Nephew (son of father’s daughter)
83. Brother
84. Grandfather (mother’s only daughter is mother)
85. Uncle (brother of Q, father of P)
86. Grandfather (father of father)
87. Daughter (daughter of father’s son = daughter)
88. Aunt (sister of mother)
89. Brother (son of mother)
90. Brother (sons of same father)

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91. Cousin (son of mother’s father)
92. Aunt (sister of mother)
93. Father (son’s mother’s husband)
94. Grandfather (father of father)
95. Brother (sons of same father)
96. Grandfather (father of father)
97. Grandmother (mother of uncle)
98. Siblings
99. Father-in-law (son of Z)
100. Brother-in-law (husband of sister)