## Blood Relation

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

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

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 aunt

Relations from one generation to next:

Type 1:
If A + B means A is the mother of B; A x B means A is the father of B; A \$ B means A is the brother of B and A @ B means A is the sister of B then which of the following means P is the son of Q?
(A) Q + R @ P @ N (B) Q + R * P @ N
(C) Q x R \$ P @ N (D) Q x R \$ P \$ N
Solution: (D)
Q x R = Q is the mother of R [-Q, ±R]
R \$ P = R is the brother of P [+ R, ±P]
P \$ N = P is the brother of N [+ P, ±N]
Therefore P is the son of Q.

Type 2:
A has 3 children. B is the brother of C and C is the sister of D, E who is the wife of A is the mother of D. There is only one daughter of the husband of E. what is the relation between D and B?
Solution: With the chart

Therefore, D is a boy because there is only one daughter of E.
Hence, B is the brother of D.

Type 3:
Pointing to a photograph, Rekha says to Lalli, "The girl in the photo is the second daughter of the wife of only son of the grandmother of my younger sister." How this girl of photograph is related to Rekha?
Solution:
First Method - By Generating Charts:

Second method:
Grandmother of younger sister of Rekha → Grandmother of Rekha
Wife of only son of grandmother → Mother of Rekha
Younger daughter of the mother → Younger sister.
Note: While solving the question (+) can be used for male and (-) can be used for female.

SOLVED EXAMPLES
1. Pointing to a photograph of a boy Suresh said, "He is the son of the only son of my mother." How is Suresh related to that boy?
 A. Brother B. Uncle C. Cousin D. Father
The boy in the photograph is the only son of the son of Suresh's mother i.e., the son of Suresh. Hence, Suresh is the father of boy.
2. If A + B means A is the mother of B; A - B means A is the brother B; A % B means A is the father of B and A x B means A is the sister of B, which of the following shows that P is the maternal uncle of Q?
 A. Q - N + M x P B. P + S x N – Q C. P - M + N x Q D. Q - S % P
N
P - M → P is the brother of M
M + N → M is the mother of N
N x Q → N is the sister of Q
Therefore, P is the maternal uncle of Q.
3. If A is the brother of B; B is the sister of C; and C is the father of D, how D is related to A?
 A. Brother B. Sister C. Nephew D. Cannot be determined
If D is Male, the answer is Nephew.
If D is Female, the answer is Niece.
As the sex of D is not known, hence, the relation between D and A cannot be determined.
Note: Niece - A daughter of one's brother or sister, or of one's brother-in-law or sister-in-law. Nephew - A son of one's brother or sister, or of one's brother-in-law or sister-in-law.
4. If A + B means A is the brother of B; A - B means A is the sister of B and A x B means A is the father of B. Which of the following means that C is the son of M?
 A. M - N x C + F B. F - C + N x M C. N + M - F x C D. M x N - C + F
M x N → M is the father of N
N - C → N is the sister of C
and C + F → C is the brother of F.
Hence, M is the father of C or C is the son of M.
5.Introducing a boy, a girl said, "He is the son of the daughter of the father of my uncle." How is the boy related to the girl?
 A. Brother B. Nephew C. Uncle D. Son-in-law
The father of the boy's uncle → the grandfather of the boy and daughter of the grandfather → sister of father.
6. Pointing to a photograph Lata says, "He is the son of the only son of my grandfather." How is the man in the photograph related to Lata?
 A. Brother B. Uncle C. Cousin D. Data is inadequate
The man in the photograph is the son of the only son of Lata's grandfather i.e., the man is the son of Lata's father. Hence, the man is the brother of Lata.

7.If A + B means A is the brother of B; A x B means A is the son of B; and A % B means B is the daughter of A then which of the following means M is the maternal uncle of N?
 M + O x N M % O x N + P M + O % N None of these
Because the sex of O is not known.
8. If D is the brother of B, how B is related to C? To answer this question which of the statements is/are necessary?
The son of D is the grandson of C.
B is the sister of D.
 Only 1 Only 2 Either 1 or 2 1 and 2 both are required
Given: D is the brother of B.
From statement 1, we can detect that D is son of C (son of D is the grandson of C).
From statement 2, we can detect that B is 'Female' (sister of D).
Therefore, B is daughter of C.

9. If A + B means A is the father of B; A - B means A is the brother B; A % B means A is the wife of B and A x B means A is the mother of B, which of the following shows that M is the maternal grandmother of T?
 M x N % S + T M x N - S % T M x S - N % T M x N x S % T
M x N → M is the mother of N
N % S → N is the wife of S
and S + T → is the father of T.

10.Pointing to a photograph. Bajpai said, "He is the son of the only daughter of the father of my brother." How Bajpai is related to the man in the photograph?
 Nephew Brother Father Maternal Uncle
The man in the photo is the son of the sister of Bajpai. Hence, Bajpai is the maternal uncle of the man in the photograph.
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