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

Definition

A person who is related to another by birth rather than by marriage.
Blood Relations | Logical Reasoning (LR) and Data Interpretation (DI) - CAT

Prerequisites

To remember easily the relations may be divided into two sides as given below:

  1. Relations of Paternal side
    Father’s father → Grandfather
    Father’s mother → Grandmother
    Father’s brother → Uncle
    Father’s sister → Aunt
    Children of uncle → Cousin
    Wife of uncle → Aunt
    Children of aunt → Cousin
    Husband of aunt → Uncle
  2. Relations of Maternal side:
    Mother’s father → Maternal grandfather
    Mother’s mother → Maternal grandmother
    Mother’s brother → Maternal uncle
    Mother’s sister → Aunt
    Children of maternal uncle → Cousin
    Wife of maternal uncle → Maternal aunty
  3. Relations:
1 Grandfather’s son  Father or Uncle
2 Grandmother’s son  Father or Uncle
3 Grandfather’s only son  Father
4 Grandmother’s only son  Father
5 Mother’s or father’s mother  Grandmother
6 Son’s wife  Daughter-in-Law
7 Daughter’s husband  Son-in-Law
8 Husband’s or wife’s sister  Sister-in-Law
9 Brother’s son  Nephew
10 Brother’s daughter  Niece
11 Uncle or aunt’s son or daughter  Cousin
12 Sister’s husband  Brother-in-Law
13 Brother’s wife  Sister-in-Law
14 Grandson’s or grand daughter’s     daughter  Great grand Daughter


The efficiency in doing the problems of blood relations depends upon the knowledge of the blood relations. Some of the important relations are given below:

  1. My mother’s or father’s son is my Brother.
  2. My mother’s or father’s daughter is my Sister.
  3. My mother’s or father’s father is my Grandfather.
  4. My mother’s or father’s sister is my Aunt.
  5. My mother’s or father’s brother is my Uncle.
  6. My son’s wife is my Daughter-in-law.
  7. My daughter’s husband is my Son-in-law.
  8. My brother’s son is my Nephew.
  9. My brother’s daughter is my Niece.
  10. My sister’s husband is my Brother-in-law.
  11. My brother’s wife is my Sister-in-law.
  12. My husband’s wife’s sister is my Sister-in-law.
  13. My husband’s or wife’s brother is my Brother-in-law.
  14. My uncle’s or aunt’s son or daughter is my Cousin.
  15. My wife’s father or husband’s father is my Father-in-law.
  16. My wife’s mother or husband’s mother is my Mother-in-law.
  17. My father’s wife is my Mother.
  18. My mother’s husband is my Father.
  19. My son’s or daughter’s son is my Grandson.
  20. My son’s or daughter’s daughter is my Grand-daughter.

Different Types of Questions with Explanation

Q.1. A is B’s daughter, B is C’s mother. D is C’s brother. How is D related to A?
(a) Father
(b) Grandfather
(c) Brother
(d) Son
Ans: c

A and C are both daughters of B. D being the brother of C  he is also a brother of A


Q.2. P is Q’s brother. R is Q’s mother. S is R’s father. T is S’s mother. How is P related to T
(a) Grand-daughter
(b) Great-grandson
(c) Grandson
(d) Grandmother
Ans: b

P is the brother of Q. Therefore, P is a male. R is the mother of P and Q and R are daughters of S. S is the son of T. S is the grandfather of P. Therefore, P is the great-grandson of T.

Q.3. A is B’s brother. C is D’s father. E is B’s mother. A and D are brothers. How is E related to C?
(a) Sister
(b) Sister-in-law
(c) Niece
(d) Wife
Ans: d

C is the father of A, B and D.
E is the mother of A, B and D.
Therefore, E is the wife of C.
Deductions:
(i) A and D are brothers of D
(ii) C is the father of A, B and D
(iii) C is the mother of A, B and D
(iv) E is wife of C

Q.4. A is the sister of B. B is the brother of C. C is the son of D. How is D related to A?
(a) Mother
(b) Daughter
(c) Son
(d) Uncle
Ans: a
As per the question, A is the sister of B and C whereas D is the father or mother of A, B and C. Therefore, D is the mother of B.

Q.5. B is the brother of A. whose only sister is mother of C. D is maternal grandmother of C. How is A related to D?
(a) Daughter-in-law
(b) Daughter
(c) Aunt
(d) Nephew
Ans: b
Although sex of A is not mentioned clearly in the question. On the basis of information given is A is daughter of B.

Q.6. A and B are sisters. R and S are brothers. A’s daughter is R’s sister. What is B’s relation to S?
(a) Mother
(b) Grandmother
(c) Sister
(d) Aunt
Ans: d
A and B are sisters.
A's daughter is R's sister hence she is S's sister also.
Then A has three children one daughter and two sons (R and S).
Hence, B is the aunt of S.

Q.7. E is the sister of B. A is the father of C. B is the son of C. How is A related to E?
(a) Grandfather
(b) Grand-daughter
(c) Father
(d) Great-grandfather
Ans: a
A is father of C, who is father of B that means A is Grandfather of B E is B’s sister, so A is also Grand father of E.

Q.8. Given that:
A is the mother of B.
C is the son of A.
D is the brother of E.
E is the daughter of B.
Who is grandmother of D?
(a) A
(b) B
(c) C
(d) D
Ans: a
E is the daughter of B and D is brother of E. Therefore, D is son of B and A is mother of B. Thus, A is grandmother of D.

Q.9. A is D’ brother. D is B’s father. B and C are sisters. How is A related to C?
(a) Son
(b) Grandson
(c) Father
(d) Uncle
Ans: d
B and C daughters of D .
A is brother of D .
Therefore A is uncle of C.

Q.10. A is B’s sister. C is B’s mother. D is C’s father. E is D’s mother, then how A is related to D?
(a) Grandfather
(b) Daughter
(c) Grandmother
(d) Granddaughter
Ans: d

From the information given, it can be concluded:
A is B's sister and their mother is C.
D is their grandfather and E is their great-grandmother.
So, A is the granddaughter of A.


Q.11. (i) F is the brother of A.
(ii) G is the daughter of A.
(iii) K is the sister of F.
(iv) G is the brother of C.

Who is the uncle of G?
(a) A
(b) C
(c) K
(d) F
Ans: d
G ⇒ brother of C.
C ⇒ daughter of A.
So, G ⇒ son of A.
F ⇒ brother of A.
Therefore, F is the uncle of G.

Q.12. A is father of C and D is son of B. E is brother of A. If C is sister of D, how is B related to E?
(a) Sister-in-law
(b) Sister
(c) Brother
(d) Brother-in-law
Ans: a
A is father of C and C is sister of D. So, A is father of D. But D is son of B. So, B is the mother of D and wife of A. Also, E is the brother of A. So, B is the sister-in-law of E. 

Q.13. C is wife of B. E is the son of C, A is the brother of B and father of D. What is the relationship of E to D?
(a) Mother
(b) Sister
(c) Brother
(d) Cousin
Ans: c
E is B and C.
A is uncle of E and Father of D.
Therefore E is cousin of D.

Q.14. M is the son of P. Q is the grand-daughter of O, who is the husband of P. How is M related to O?
(a) Son
(b) Daughter
(c) Mother
(d) Father
Ans: a
O is the Husband of P. M is the son of P.
Therefore, M is son of O.

Q.15. X and Y are brothers. R is the father of Y. S is the brother of T and maternal uncle of X. What is T to R?
(a) Mother
(b) Wife
(c) Sister
(d) Brother
Ans: b
R is the father of Y and X.
S is the maternal uncle of X and Y.
So, T is the mother of X and Y.
Thus, T is the wife of R.

The document 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 Blood Relations - Logical Reasoning (LR) and Data Interpretation (DI) - CAT

1. What is the definition of blood relations?
Ans. Blood relations refer to the familial relationships that exist between individuals based on their shared genetic ties. It includes relationships such as parent-child, sibling, grandparent-grandchild, etc.
2. What are the prerequisites for understanding blood relations?
Ans. To understand blood relations, one should have a basic understanding of family tree structures and the terminology used to describe relationships within a family. It is also helpful to be familiar with the concept of genetics and how traits are inherited.
3. What are the different types of questions that can be asked about blood relations?
Ans. Different types of questions that can be asked about blood relations include questions related to the relationship between two individuals in a family, questions about the number of members in a family, questions about the generation gap between individuals, questions about the gender of individuals, and questions about the order of birth among siblings.
4. How can blood relations be tested in the CA Foundation exam?
Ans. In the CA Foundation exam, blood relations can be tested through questions that require the identification of relationships between individuals based on given information or through questions that involve solving family tree puzzles. These questions assess the candidate's ability to understand and analyze familial relationships.
5. Can you provide an example of a blood relations question with a detailed answer?
Ans. Example: In a family, A is the son of B, who is the brother of C. D is the daughter of C. How is D related to A? Answer: D is the niece of A. A's mother is C and C is the sister of B, who is A's father. Therefore, D, being the daughter of C, is A's niece.
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