Group D General Intelligence & Reasoning: Blood Relations — Concept Guide + MCQs

What are Blood Relations Problems?

Blood relation problems test your ability to decode family relationships from verbal or symbolic descriptions.

Key Family Relationship Terms

RelationMeaning
Father's/Mother's sonBrother
Father's/Mother's daughterSister
Father's brotherPaternal Uncle (Chacha/Tau)
Mother's brotherMaternal Uncle (Mama)
Father's/Mother's fatherGrandfather (Dada/Nana)
Spouse's fatherFather-in-law
Brother's sonNephew
Brother's daughterNiece
Uncle/Aunt's childCousin

Shortcut Tricks

Draw the family tree! Always draw a diagram with arrows showing relationships.
Start from a fixed point: Begin with the person mentioned first and trace relationships step by step.
Gender clues: 'Son', 'Brother', 'Father', 'Uncle', 'Husband' = Male. 'Daughter', 'Sister', 'Mother', 'Aunt', 'Wife' = Female.
Symbolic coding: +means father, –means wife, ×means brother — decode the symbols systematically.
Beware of gender-neutral terms like 'cousin' (can be male/female) and 'sibling'.

Common Trap Questions

  • "My father's only son" = Myself (if no siblings)
  • "My mother's only daughter-in-law" = My wife
  • "Pointing to a man, a woman says 'His mother is my mother's only daughter-in-law'" → the man is her son

Practice MCQs

Q1. A is B's brother. C is A's mother. How is C related to B?

  • A) Mother
  • B) Aunt
  • C) Sister
  • D) Grandmother

Answer: A — A and B are siblings (A is B's brother). C is A's mother → C is also B's mother.

Q2. Pointing to a man, a girl says 'He is the son of my mother's sister.' How is the man related to the girl?

  • A) Cousin
  • B) Brother
  • C) Nephew
  • D) Uncle

Answer: A — Mother's sister = aunt. Aunt's son = cousin.

Q3. If Sita says 'Ravi's mother is my mother's only daughter', how is Sita related to Ravi?

  • A) Grandmother
  • B) Mother
  • C) Aunt
  • D) Sister

Answer: B — My mother's only daughter = Sita herself. Ravi's mother = Sita → Sita is Ravi's mother.

Q4. A's father is B's son. How is A related to B?

  • A) Grandson
  • B) Son
  • C) Father
  • D) Brother

Answer: A — B's son = A's father. B is A's grandfather. A is B's grandson.

Q5. Meena is the daughter of Ram's mother's brother. How is Meena related to Ram?

  • A) Cousin
  • B) Sister
  • C) Niece
  • D) Aunt

Answer: A — Ram's mother's brother = Ram's maternal uncle. Uncle's daughter = Ram's cousin.

Q6. How is your mother's mother's son related to you?

  • A) Maternal uncle
  • B) Father
  • C) Uncle
  • D) Grandfather

Answer: A — Mother's mother = maternal grandmother. Her son = mother's brother = maternal uncle.

Q7. Pointing to a boy, Reena says 'He is the son of my father's only son.' How is the boy related to Reena?

  • A) Nephew
  • B) Brother
  • C) Son
  • D) Cousin

Answer: B — Father's only son = Reena's brother (if no other sons) or Reena's father if Reena is female. Father's only son → if Reena has no brothers, then father's only son = Reena's father → his son = Reena's brother. Answer B=Brother.

Q8. If A is B's sister and B is C's brother and C is D's mother, how is A related to D?

  • A) Aunt
  • B) Mother
  • C) Sister
  • D) Cousin

Answer: A — C is D's mother. B is C's brother. A is B's sister → A is also C's sister. C's sister = D's aunt.

Q9. If X is the brother of Y, Y is the daughter of Z, Z is the father of W, then how is X related to W?

  • A) Brother
  • B) Sister
  • C) Cannot be determined
  • D) Cousin

Answer: C — Y is Z's daughter. X is Y's brother → X is also Z's child. W is Z's child (son or daughter unknown). X and W are siblings — brother or sister depending on gender. Cannot be determined without gender info.

Q10. My mother's sister's husband is my:

  • A) Maternal uncle
  • B) Paternal uncle
  • C) Uncle by marriage
  • D) Father

Answer: C — Mother's sister = maternal aunt. Her husband = uncle by marriage (maternal uncle by marriage).