Blood Relations

Blood Relations in LRDI involve solving puzzles where family members’ relationships are described through statements, and you must determine exact connections or build a family tree. Unlike direct blood relation questions, LRDI sets often include multiple members, extended family, and layered clues, requiring systematic arrangement.

Common Types of Blood Relation Problems

  1. Direct Relationships

    • Simple parent–child or sibling relations.
    • Example: “A is the mother of B.”

  2. Indirect/Chain Relationships

    • Multi-step relations traced through multiple people.
    • Example: “A is the father of B. B is the sister of C. How is A related to C?”

  3. Coded Relations

    • Relations expressed through symbols.
    • Example: “A @ B means A is the sister of B.”

  4. Puzzle-Based Family Trees

    • Larger sets with multiple generations.
    • Example: “There are six members in a family: two married couples, parents, and children.”

  5. Mixed with Seating/Arrangement

    • Blood relations combined with seating arrangement or group distribution problems.

Key Steps to Solve

  1. Identify relationships clearly: Note gender markers (brother, sister, husband, wife).
  2. Draw diagrams: Use a family tree or flow chart to reduce confusion.
  3. Apply logical direction: Work step by step from the given person outward.
  4. Decode symbols carefully: Translate symbolic clues into real relations.
  5. Cross-check for consistency: Ensure no contradictions in gender or placement.

Conceptual Tips and Common Mistakes

  • Gender assumptions: Don’t assume gender unless explicitly stated.
  • In-law vs direct: Remember “brother-in-law” ≠ “brother.”
  • Generational gap: Always mark generations (grandparents, parents, children).
  • Order in statements: Sometimes last statement gives the crucial clue.
  • Coded puzzles: Learn common symbol-to-relation decoding quickly.

Examples

Example 1 — Direct Relation

Statement: A is the father of B. B is the mother of C.
Answer: A is the grandfather of C.

Example 2 — Chain Relation

Statement: X is the brother of Y. Y is the mother of Z.
Answer: X is the maternal uncle of Z.

Example 3 — Coded Relation

If A @ B = A is the sister of B, and B # C = B is the husband of C,
then A @ B # C → A is the sister-in-law of C.

Example 4 — Puzzle-Based

Family has 6 members: A, B, C, D, E, F.

  • A is the mother of B.
  • B is the brother of C.
  • C is the wife of D.
  • E is the son of D.
  • F is the father of A.
    Answer: F is the great-grandfather of E.
PRACTICE QUESTIONS
PREVIOUSNEXT