CHSL 2026 — General Intelligence & Reasoning: Blood Relations Concept Guide + 10 MCQs

Master Blood Relations for CHSL 2026. This guide covers theory, shortcuts, and 10 practice MCQs.

Concept: Blood Relations

Blood Relations trace family connections. Key rule: draw a family tree. Use ♂/♀ to mark gender clearly.

Key Terms

  • Uncle/Aunt = parent's sibling
  • Nephew/Niece = sibling's child
  • Cousin = uncle/aunt's child
  • In-law = spouse's relative

⚡ Shortcuts & Tricks

  • Always draw the family tree
  • Mark gender with symbols
  • 'Only son/daughter' clues are critical
  • Decode coded relations step by step

Practice MCQs (10 Questions)

Q1. A is the mother of B. C is the brother of A. What is C to B?

  • A. Uncle
  • B. Nephew
  • C. Cousin
  • D. Father
Answer: A — C is A's brother. A is B's mother. So C is B's maternal uncle.

Q2. Pointing to a woman, Ravi says 'She is the only daughter of my grandfather's son.' How is she related?

  • A. Sister
  • B. Mother
  • C. Aunt
  • D. Niece
Answer: A — Grandfather's son = father. Father's only daughter = sister.

Q3. A woman introduces a man as son of her mother's brother. How is the man related?

  • A. Cousin
  • B. Nephew
  • C. Uncle
  • D. Son
Answer: A — Mother's brother = uncle. Uncle's son = cousin.

Q4. Rohit's mother is the only daughter of Seema's father. How is Seema related to Rohit?

  • A. Mother
  • B. Sister
  • C. Aunt
  • D. Grandmother
Answer: A — Only daughter of Seema's father = Seema. So Seema is Rohit's mother.

Q5. Pointing at a man, a lady says 'His mother is the only daughter of my mother.' Relation of lady to man?

  • A. Mother
  • B. Sister
  • C. Grandmother
  • D. Aunt
Answer: A — Only daughter of lady's mother = lady herself. So the man's mother = the lady.

Q6. P is brother of Q. R is mother of Q. S is father of R. How is P related to S?

  • A. Grandson
  • B. Nephew
  • C. Son
  • D. Grandfather
Answer: A — R is P and Q's mother. S is R's father. So S is P's grandfather and P is S's grandson.

Q7. A + B = A is father of B. A - B = A is mother of B. P + Q - R means P is R's ___?

  • A. Grandfather
  • B. Grandmother
  • C. Father
  • D. Uncle
Answer: A — P is Q's father. Q is R's mother. So P is R's maternal grandfather.

Q8. X says to Y: 'Your mother's husband's sister is my aunt.' How is Y related to X?

  • A. Sibling
  • B. Nephew/Niece
  • C. Cousin
  • D. Parent
Answer: A — Y's mother's husband = Y's father. Father's sister = aunt. Same aunt as X's → Y and X are siblings.

Q9. Introducing Rita, Sonu says 'She is the wife of my wife's only brother.' Rita is Sonu's ___?

  • A. Sister-in-law
  • B. Wife
  • C. Niece
  • D. Cousin
Answer: A — Wife's brother = brother-in-law. His wife = Sonu's sister-in-law.

Q10. A is B's sister. C is B's mother. D is C's father. How is A related to D?

  • A. Granddaughter
  • B. Daughter
  • C. Grandmother
  • D. Great Granddaughter
Answer: A — A is C's daughter. D is C's father. So A is D's granddaughter.

Summary

Draw a family tree for blood relation problems. Never solve complex ones mentally.