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Introduction: Blood Relations | Logical Reasoning (LR) and Data Interpretation (DI) - CAT PDF Download

What is Blood Relation?

Blood Relation refers to the connection between two individuals established through their birth rather than through marriage or any other factors. Blood Relation questions entail the analysis of information depicting the familial relationships among its members. In these questions, a series of relationships is presented in informational form, and candidates are required to determine the relationship between two members of the family based on this provided information.

Candidates need to be acquainted with the hierarchical structure of the family, typically spanning three generations above and three generations below the current generation. In essence, Blood Relation reasoning involves inquiries aimed at identifying relationships among family members. Using the provided information, candidates must deduce relationships, such as those by birth (e.g., mother, father, son, daughter) or by marriage (e.g., father-in-law, mother-in-law, sister-in-law).

Types of Blood Relation

Now that we have an understanding of what constitutes a Blood Relation reasoning section, let's explore the various types of Blood Relation reasoning questions individually.

Pointing or Introducing

  • In these pointing or introducing questions, an individual indicates or introduces someone through conversation or by other means. Candidates are tasked with identifying the relationship between the individuals. To illustrate, consider the following example of a blood reasoning question:
    Example: Rahul points to a lady and says, “She is the wife of my mother’s father’s only grandchild.” How is that lady related to Rahul?
    Solution: By constructing the family tree, we can deduce that Rahul's mother's father is his grandfather. The only grandchild of Rahul's grandfather is a male (Rahul himself), making the lady the wife of Rahul. Therefore, the correct answer is "Wife."

Family Tree 

  • In these Blood Relation reasoning questions, information about the relationship between different family members is provided, and candidates are asked to determine the relationship between any two of them. This type of question is also known as "by law" or "by blood" Blood Relation reasoning.
    Example: Rahul is Mohan's son. Hari is Manu's father. Rahul is married to Dina. Rahul and Manu are siblings. Kanav is Dina's brother. Mohan has only one son. Neha is Rahul's child. Kanav is Akash's father. What is the relationship between Kanav and Akash, respectively?
    Solution: Upon careful examination, we find that Kanav is Akash's father, but Akash's gender is not specified. Therefore, the correct answer is "Cannot be determined" based on the given statements.

Coded Relation

  • In this category of blood relation questions, family members are denoted by specific codes or symbols, such as +, $, *, &, #, @, !, etc. Candidates are required to decipher the symbols or codes to arrive at the accurate relationships.
  • Example: First consider the below statements carefully. 

    P $ Q implies that P is the sister of Q
    P % Q implies that P is the brother of Q
    P & R implies that P is the mother of R
    P @ S implies that P is the son of S
    Now find out the relationship between F and D from the following expression such as D % C @ G $ H $ F
    Solution: The above statements implies the following things.
    Introduction: Blood Relations | Logical Reasoning (LR) and Data Interpretation (DI) - CATSo by analysing the above table we can deduce the above expression D % C @ G $ H $ F as “D is the brother of C”, “C is the son of G”, “G is the sister of H”, and “H is the sister of F”. The gender of F is unknown. So F can be either uncle or aunt of D. Therefore, the correct response for this question will be “Uncle or Aunt”.

Given below is the list of some different types of relation which are most commonly asked in this blood relation reasoning section in various Govt. exams. Have a look at them to be more familiar with these various relations.

Introduction: Blood Relations | Logical Reasoning (LR) and Data Interpretation (DI) - CAT

The document Introduction: Blood Relations | Logical Reasoning (LR) and Data Interpretation (DI) - CAT is a part of the CAT Course Logical Reasoning (LR) and Data Interpretation (DI).
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FAQs on Introduction: Blood Relations - Logical Reasoning (LR) and Data Interpretation (DI) - CAT

1. What is blood relation?
Ans. Blood relation refers to the familial relationship between individuals who are related by birth, marriage, or adoption. It includes relationships such as parents, siblings, grandparents, aunts, uncles, cousins, and so on.
2. What are the types of blood relations?
Ans. The types of blood relations include: 1. Direct Relations: These are relationships that are directly connected to the person, such as parents, siblings, and children. 2. Indirect Relations: These are relationships that are not directly connected to the person but are connected through direct relations. For example, the aunt of a person is an indirect relation. 3. Immediate Relations: These are the closest relationships, such as parents, siblings, and children. 4. Extended Relations: These are relationships beyond the immediate family, such as grandparents, aunts, uncles, and cousins.
3. How are blood relations important in solving logical reasoning problems?
Ans. Blood relations are important in solving logical reasoning problems as they often involve analyzing and deducing relationships between individuals based on given information. Understanding blood relations helps in drawing accurate conclusions, making logical connections, and solving complex reasoning problems.
4. What are some common blood relation problems asked in competitive exams?
Ans. Some common blood relation problems asked in competitive exams include: 1. Finding the relationship between two individuals based on given information. 2. Determining the number of male or female members in a family. 3. Identifying the position of individuals in a family tree. 4. Solving puzzles or riddles related to blood relations. 5. Finding the next generation or the previous generation in a family.
5. What are some tips to solve blood relation problems effectively?
Ans. Here are some tips to solve blood relation problems effectively: 1. Understand the given information clearly and create a family tree or diagram. 2. Identify the direct and indirect relations between individuals. 3. Use the given clues to deduce additional information or relationships. 4. Make logical connections and eliminate contradictory possibilities. 5. Use visual aids or symbols to represent different relationships. 6. Practice solving different types of blood relation problems to improve speed and accuracy.
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