Blood Relation
Blood relations are a common topic in competitive exams, particularly in the reasoning section. This topic tests your ability to understand and interpret relationships between different members of a family based on given information. Here’s a detailed explanation to help you prepare:
- Understanding Basic Relationships:
- Father/Mother: The male/female parent of a person.
- Son/Daughter: The male/female child of a person.
- Brother/Sister: A male/female sibling.
- Husband/Wife: A married man/woman.
- Uncle/Aunt: Brother/sister of one’s parent or the husband/wife of the parent’s sibling.
- Nephew/Niece: Son/daughter of one’s brother or sister.
- Cousin: Child of one’s uncle or aunt.
- Grandfather/Grandmother: Father/mother of one’s parent.
- Grandson/Granddaughter: Son/daughter of one’s child.
- Father-in-law/Mother-in-law: Father/mother of one’s spouse.
- Brother-in-law/Sister-in-law: Brother/sister of one’s spouse or spouse of one’s sibling.
- Common Types of Questions:
- Single Person Relationship: These questions give you information about one person and ask about their relation to another person.
- Example: “A is B’s father. How is B related to A?” (Answer: Son/Daughter)
- Coded Relations: These questions involve a code or symbols to represent relationships.
- Example: “If A + B means A is the father of B, A – B means A is the mother of B, and A * B means A is the brother of B, then what does A + B – C mean?” (Answer: A is the father of B, and B is the mother of C, so A is the maternal grandfather of C.)
- Puzzle-based Relations: These questions involve a scenario with multiple people and their relationships, where you must deduce the relationships between them.
- Example: “P, Q, R, S, T, U, and V are seven members of a family. P is the father of Q, who is the sister of R. S is the wife of P. T and U are brothers, and U is the son of S. V is the daughter of S. How is R related to U?” (Answer: R is U’s sister/brother depending on the gender of R.)
- Techniques to Solve Blood Relation Problems:
- Identify Relationships Clearly: Start by identifying who is related to whom and how. Draw a family tree or diagram if necessary.
- Work Backwards: Sometimes, starting from the end of the information provided can help to clarify relationships.
- Use Gender Information: Pay attention to gender-specific terms like son, daughter, father, mother, etc., to eliminate possibilities.
- Practice Symbols: Get comfortable with coded relationships using symbols to represent relationships in shorthand.
- Practice Examples:
Example 1:
- Statement: “A is the brother of B. C is the father of A. D is the mother of B. How is B related to C?”
- Solution: B is the son/daughter of C.
Example 2:
- Statement: “If A + B means A is the mother of B, A * B means A is the sister of B, and A – B means A is the father of B, then what is the relationship of C to A in the expression A + B * C?”
- Solution: B is the sister of C, and A is the mother of B. Therefore, C is the son/daughter of A.
Example 3:
- Puzzle: “In a family of six members A, B, C, D, E, and F, there are two married couples. D is a doctor and the father of E. F is the grandfather of E and is a lawyer. B is married to F, and A is a teacher. How is C related to E?”
- Solution: C is E’s mother.
- Tips for Exam Preparation:
- Regular Practice: The more you practice, the quicker you’ll recognize patterns and relationships.
- Use Diagrams: Drawing a simple family tree can often make complex relationships easier to understand.
- Time Management: Learn to solve these questions quickly as they can be time-consuming.
- Advanced Relationships and Scenarios
- Mixed Gender Relations:
Some questions deliberately omit gender-specific information to increase complexity. You may have to deduce gender based on relationships.
Example 1:
- Statement: “A is the child of B. B is the child of C. C is the mother of D. How is A related to D?”
- Solution: A is the grandchild of D. Since C is the mother of D, B can be either son or daughter, making A the grandson or granddaughter of D.
Example 2:
- Statement: “P is Q’s brother. R is P’s mother. S is R’s mother. How is Q related to S?”
- Solution: Q is S’s great-grandchild (grandson/granddaughter).
- Circular Relationships:
These questions present information in a circular manner, which may require you to loop back through the relationships to identify the connections.
Example:
- Statement: “A is the mother of B, B is the sister of C, C is the father of D, and D is the son of A.”
- Solution: This is an impossible scenario because D cannot be both A’s son and C’s child if C is the father. If this occurs, you might be dealing with a trick question.
- Two or More Families Interlinked:
These questions involve multiple families or generations, creating a complex web of relationships.
Example:
- Statement: “M and N are siblings. O is M’s daughter. P is O’s brother. Q is the father of P. R is N’s son. How is R related to P?”
- Solution: R is P’s cousin.
- Techniques for Complex Problems
- Family Tree Method:
When faced with complex relations, draw a family tree. Each person can be represented as a node, and their relationship as a connection.
Steps:
- Start with the Given Information: Place the initial person at the center.
- Add Connections: Draw lines to represent relationships (e.g., a line up from child to parent, sideways for siblings).
- Expand Outwards: Add additional members as you interpret the question.
Example:
- Statement: “A is married to B. C is the brother of A. D is the father of C. B and E are sisters. How is E related to D?”
- Solution: E is D’s daughter-in-law’s sister. Therefore, D is E’s father-in-law.
- Reverse Engineering:
Sometimes starting from the last piece of information and working backward can help untangle tricky questions.
Example:
- Statement: “Ravi said, ‘Ramu is the son of the father of my sister’s brother.’ How is Ramu related to Ravi?”
- Solution: Ravi’s sister’s brother is Ravi himself. Therefore, the father of Ravi’s sister’s brother is Ravi’s father. Ramu is the son of Ravi’s father, making Ramu Ravi’s brother.
- Special Cases:
- Age-Based Relationships:
Some questions include age clues to help determine relationships.
Example:
- Statement: “A is older than B. C is younger than A. D is the oldest. Who is the youngest?”
- Solution: If D is the oldest, and A is older than B, with C younger than A, B is the youngest.
- Gender Neutral Names:
Some questions use names that do not clearly indicate gender, requiring careful analysis of the context.
Example:
- Statement: “Alex is the parent of Taylor. Taylor is the parent of Sam. Sam is the sister of Jamie. How is Alex related to Jamie?”
- Solution: Alex is Jamie’s grandparent.
- Practice Questions for Mastery:
Example 1:
- Statement: “John is the son of Mary. Mary is the daughter of Ann. Ann is the wife of Peter. How is John related to Peter?”
- Solution: John is Peter’s grandson.
Example 2:
- Statement: “If A * B means A is the brother of B, A + B means A is the father of B, and A – B means A is the mother of B, then what is the relationship between A and C in A + B – C?”
- Solution: A is the father of B, and B is the mother of C, so A is C’s maternal grandfather.
Example 3:
- Statement: “Sita’s mother’s brother’s only daughter is Meera. How is Meera related to Sita?”
- Solution: Meera is Sita’s cousin.
- Tips for Advanced Blood Relation Questions:
- Focus on Key Words: Words like “only,” “youngest,” “oldest,” and gender-specific pronouns are often crucial to understanding the relationships.
- Handle Complexity Gradually: Break down the problem into smaller parts and solve each part step by step.
- Cross-Verification: After arriving at a solution, cross-check it with the given conditions to ensure accuracy.
- Practice Different Patterns: Familiarize yourself with a variety of question patterns, including puzzles, coded relations, and multiple generations.
By mastering these techniques and practicing regularly, you’ll be well-prepared to tackle any blood relation questions that come your way in competitive exams.
