Rajasthan TET – Reasoning Ability
Blood Relations (Relation between family members)
1. Simple Explanation
Blood relations (also called kinship relations) describe how two people are connected by family ties—through parents, grandparents, siblings, cousins, etc.
In TET reasoning questions you will be given a set of relationships and asked to find the relation between two persons (e.g., “what is the relation of X to Y?”).
Key Idea
- Every person has a generation (grand‑, parent‑, child‑, grand‑child‑, etc.).
- The gender of the person (male/female) determines the specific term (son, daughter, brother, sister, etc.).
- Once you map the chain of relationships, you can deduce the final relation.
2. Key Points to Remember
| Term | Meaning | Example |
|---|---|---|
| Parent | Mother / Father | A is the mother of B |
| Sibling | Brother / Sister | B is the sister of C |
| Grand‑ | Grand‑mother / Grand‑father | D is the grand‑father of E |
| Uncle / Aunt | Brother of a parent / Sister of a parent | F is the aunt of G |
| Cousin | Child of a sibling of a parent | H is the cousin of I |
| In‑law | Spouse’s relative | J is the mother‑in‑law of K |
| Great‑ | Two generations above or below | L is the great‑grand‑father of M |
| Niece / Nephew | Daughter/son of a sibling | N is the niece of O |
| Step‑ | Relation through marriage, not blood | P is the step‑father of Q (not required in most TET problems) |
Rules
- Direction – If A is B’s mother, then B is A’s son/daughter.
- Same Generation – Siblings, cousins, aunts, uncles, aunts‑in‑law, etc.
- Different Generations – Grand‑, great‑, etc.
- Gender‑Specific Terms – Use male/female forms (son vs. daughter, brother vs. sister).
- Chain Method – Write the chain of relations from the known person to the target; at each step, note the generation and gender.
3. Worked Example
Problem
“If A is B’s mother, B is C’s father, C is D’s aunt, what is the relation of D to A?”
Step‑by‑Step Solution
| Step | Relation Chain | Generation | Gender |
|---|---|---|---|
| 1 | A → B | A is the mother of B | A (female) |
| 2 | B → C | B is the father of C | B (male) |
| 3 | C → D | C is the aunt of D | C (female) |
Interpretation
- A → B: B is A’s child (generation down).
- B → C: C is B’s child (generation down).
- C → D: D is C’s niece (C is aunt → D is niece).
Now trace back to A
- D is the niece of C.
- C is the child of B.
- B is the child of A.
So, from A’s perspective:
- B is A’s son.
- C is A’s grandson (male).
- D is A’s great‑granddaughter (female).
Answer
D is the great‑granddaughter of A.
4. Quick Revision Summary
- Parent → child: mother/father → son/daughter.
- Sibling: brother/sister.
- Grand‑: one generation above/below.
- Great‑: two generations above/below.
- Uncle / Aunt: brother/sister of a parent.
- Cousin: child of a sibling of a parent.
- Niece / Nephew: child of a sibling.
- In‑law: relation through marriage (father‑in‑law, mother‑in‑law, etc.).
Quick Tips
- Draw a small family tree for complex chains.
- Write the chain of names and mark direction (up/down).
- Count the generations between the two persons.
- Check gender at each step to choose the right term.
- Common pitfalls:
- Confusing aunt/uncle with mother/father.
- Forgetting that “aunt” can be a woman of the same generation as the parent.
- Mixing up “cousin” with “nephew/niece”.
Sample Question for Practice
“E is F’s brother, F is G’s daughter, G is H’s aunt. What is the relation of H to E?”
Answer (working)
- E → F (brother) → F is male, so F is male? Actually brother of E means F is male, yes.
- F → G (daughter) → G is child of F, so G is F’s daughter.
- G → H (aunt) → H is aunt of G → H is sibling of G’s parent.
- G’s parent is F. So H is sibling of F → H is F’s sister.
- E is brother of F → E is also sibling of F.
- So H is sibling of F, i.e., H is E’s sister.
End of Notes – Good luck with your Rajasthan TET preparation!