Blood Relations
Overview
These questions test your ability to decode family relationships from given statements—either through direct descriptions or through "pointing" scenarios where one person points to another and describes the relationship.
This topic rewards systematic thinking rather than speed calculations. Students who master a clear notation system and practice drawing family trees can solve these questions in under 60 seconds. The Clerk-level problems are straightforward compared to PO, usually involving 3–5 family members with direct relationships. Your goal: build a mental map of the family quickly and accurately.
The key skill here is translation—converting verbal descriptions like "A is the son of B's mother's brother" into a visual tree. Once you can do this reliably, the questions become mechanical.
Key Concepts
- Generation levels matter: Parents/uncles/aunts sit one level above you; grandparents two levels up; children one level below. Always place family members at the correct vertical level in your tree.
- Gender identification is critical: Words like son, brother, nephew, uncle indicate male; daughter, sister, niece, aunt indicate female. Words like child, sibling, cousin, parent are gender-neutral—mark these with a question mark until confirmed.
- In-law relationships create horizontal links: Spouse connections are drawn horizontally at the same generation level. "Father-in-law of X" means X's spouse's father.
- "Only" is a game-changer: "A is the only son of B" means B has no other sons (but may have daughters). "A is the only child of B" means B has exactly one child.
- Maternal vs Paternal distinction: Maternal grandfather = mother's father; Paternal uncle = father's brother. The prefix tells you which side of the family.
- Pointing problems follow a fixed pattern: The sentence "Pointing to X, A said..." means A is describing X's relationship to A (or to someone A mentions).
- Symbols save time: Use consistent notation—male (+ or square), female (– or circle), unknown gender (?), marriage link (=), parent-child link (vertical line).
Key Facts
| Relationship Term | Meaning |
|---|---|
| Siblings | Brother or sister (same parents) |
| Cousin | Uncle's or aunt's child |
| Nephew | Brother's or sister's son |
| Niece | Brother's or sister's daughter |
| Father-in-law | Spouse's father |
| Mother-in-law | Spouse's mother |
| Brother-in-law | Spouse's brother OR sister's husband |
| Sister-in-law | Spouse's sister OR brother's wife |
Must-remember chains:
- Mother's or Father's father = Grandfather
- Mother's or Father's mother = Grandmother
- Mother's brother = Maternal uncle
- Father's brother = Paternal uncle
- Mother's or Father's sister = Aunt
- Son's wife = Daughter-in-law
- Daughter's husband = Son-in-law
Worked Examples
Example 1: Direct Statement
A is the son of B. C is the daughter of B. D is the father of B. How is A related to D?
Step 1: B has two children—A (son) and C (daughter). Step 2: D is B's father, so D is one generation above B. Step 3: A is B's son, so A is two generations below D. Step 4: A is male and two generations below D.
Answer: A is D's grandson.
Example 2: Pointing Problem
Pointing to a photograph, Ramesh said, "She is the daughter of my grandfather's only son." How is the person in the photograph related to Ramesh?
Step 1: Grandfather's only son = Ramesh's father (since grandfather has only one son, that must be Ramesh's father). Step 2: Daughter of Ramesh's father = Ramesh's sister.
Answer: Sister.
Example 3: Complex Chain
A is married to B. C is the brother of A. D is the daughter of C. E is the father of B. How is D related to E?
Step 1: Draw the tree.
- A = B (married couple)
- C is A's brother (same generation as A)
- D is C's daughter (one generation below C)
- E is B's father (one generation above B, hence also above A)
Step 2: Find the connection between D and E.
- E is B's father, so E is A's father-in-law
- C is A's brother
- D is C's daughter
Step 3: E and D have no direct blood relation. E is A's father-in-law; D is A's niece. E is not related by blood to C's side.
Answer: No direct blood relation (or "Cannot be determined" if options include it).
Example 4: Gender-neutral puzzle
X says to Y, "Your mother is the only daughter of my mother." How is X related to Y?
Step 1: X's mother has only one daughter. Step 2: Y's mother is that only daughter. Step 3: So Y's mother is X's mother's only daughter. Step 4: This means Y's mother is X's sister (and X must be male, since X's mother's only daughter is someone else). Step 5: If Y's mother is X's sister, then X is Y's maternal uncle.
Answer: X is Y's maternal uncle (mama).
Common Mistakes
- Confusing the direction of "pointing" statements → When A points to X and says "he is my father's son," students often think X is describing A. Fix: The pointer (A) is always the one describing; the relationship connects X to A.
- Ignoring gender clues → Assuming "child" or "sibling" is male by default. Fix: Mark unknown genders with "?" and only assign gender when explicitly stated or logically required.
- Miscounting generation levels → Treating cousin as same generation as nephew. Fix: Cousin = same generation (horizontal); nephew/niece = one generation below (vertical).
- Forgetting "only" constraints → Reading "only son" as just "son." Fix: "Only" eliminates other possibilities—no other sons exist.
- Mixing maternal and paternal sides → Calling mother's brother "paternal uncle." Fix: Maternal = mother's side; Paternal = father's side. The prefix always refers to whose relative it is.
Quick Reference
- Always draw a family tree—never solve blood relations mentally for 3+ people.
- Male: son, brother, father, nephew, uncle, grandson, husband.
- Female: daughter, sister, mother, niece, aunt, granddaughter, wife.
- Neutral: child, parent, sibling, cousin, spouse, grandchild, grandparent.
- "Pointing to X, A said..." → A describes X's relation to A.
- "Only" means no other person of that type exists.