How is the Girl Related to the Boy?
BLOOD RELATIONS
In this chapter a relationship between two persons is to be established based on a single statement or relationship within the whole family based on a group of statements.
First let us look at the relations:
» Father's or mother's son: Brother
» Father's or mother's daughter: Sister
» Father's or mother's father: Grandfather
» Father's or mother's mother: Grandmother
» Father's or mother's brother: Uncle
» Father's or mother's sister: Aunt
» Uncle's or aunt's son or daughter: Cousin
» Brother's or sister's son: Nephew
» Brother's or sister's daughter: Niece
» Brother's wife: Sister-in-law
» Sister's husband: Brother-in-law
» Son's or daughter's son: Grandson
» Son's or daughter's daughter: Granddaughter
» Son's wife: Daughter-in-law
» Daughter's husband: Son-in-law
Family Tree:
The relations among the members of a family can be represented in a family tree. The following method is used to represent the relations.
1) A male member is represented by a (+) sign and a female is represented by a (-) sign.
2) A parent-child relationship is denoted by a vertical or diagonal line where parent is at the top and child is at the bottom.
Parent Parent
/ (or) /
Child Child
3) A wife and husband relation is denoted by a double arrow between them. (husbandÛ wife)
4) A sibling relation (brother - brother / brother - sister / sister - sister) relation is represented by a horizontal line between them.
(brother ____ sister)
5) If data is insufficient to draw a conclusion, then it is denoted by a question mark (?).
MODEL PROBLEMS
1. Introducing a girl, a boy says, "She is the daughter of my father's only brother-in-law". How is the girl related to the boy?
1) Sister-in-law
2) Granddaughter
3) Cousin
4) Daughter
5) None of these
2. Pointing to Sam in a photograph Samridhi said, "His brother's father is the only son of my grandfather." How is Samridhi related to the Sam in the photograph?
A) Mother B) Aunt
C) Sister D) Daughter
1) D 2) B 3) A
4) C 5) None of these
3. Rahul said, "The boy in that picture is the brother of the daughter of my paternal grand- father's only son". How is the boy in the picture related to Rahul?
1) Cousin 2) Father
3) Nephew 4) Brother
5) None of these
4. Pointing to the photograph of a woman, Rohit said, "The woman in the photograph is the mother of the only daughter-in-law of my mother." How is the woman related to Rohit?
1) Aunt 2) Wife
3) Daughter 4) Mother-in-law
5) Daughter-in-law
Directions (5-6): Study the following information carefully and answer the questions given below:
U is the sister of S. S is the son of Y. Y is the only child of D. D is married to X. D is the sister of P.
5. If T is the daughter-in-law of X, how T is related to S?
1) Father 2) Sister
3) Mother 4) Cousin
5) Cannot be determined
6. How is D related to U?
1) Cannot be determined
2) Grandfather 3) Uncle
4) Grandmother 5) Aunt
Directions (7-11): Study the following information carefully and answer the questions given below:
Seven people - P, Q, R, S, T, U and V - are related to each other in some or the other way. Each person is different age, but not necessarily in the same order.
(Note: It is assumed that the husband is older than the wife.)
T is older than V but younger than U. P is the mother of Q. R is the sister-in-law of P. R is unmarried. T is the daughter-in-law of S. S is the eldest member of the family. U is the father of only R and V. U does not have any sibling. V does not have any son. R is older than V. The third eldest member of the family is 54 years old. The youngest member of the family is 4 years old.
7. If in the given arrangement, Q + V = 31, then what is the possible age of R?
1) 27 2) 56 3) 23
4) 59 5) 30
8. If P is 24 years old, what will be the sum of ages of P and T?
1) 28 2) 78 3) 64
4) 49 5) 75
9. How is T related to Q?
1) Grandmother
2) Granddaughter
3) Aunt 4) Mother-in-law
5) Mother
10. If M is married to S, then how is S related to R?
1) Grandmother
2) Granddaughter
3) Grandfather
4) Uncle
5) Cannot be determined
11. Who amongst the following is/are younger than V?
1) Both P and U
2) Only Q 3) Only P
4) Both P and Q
5) No one
Key & Explanation
1) My father's only brother-in-law Þ My only uncle
\ Daughter of my father's only brother-in-law Þ daughter of my only uncle
Daughter of my only uncle Þ My cousin
Therefore the boy says the girl is his cousin.
Ans: 3
2) His brother's father Þ his father Only son of my grandfather Þ my father
\ "His brother's father is the only son of my grandfather" Þ "His father is my father"
Þ Both Sam and Samridhi have same father.
\ Sam and Samridhi are siblings in which Sam is male and Samridhi is female.
Þ Samridhi is Sam's sister.
Ans: 4
3) My paternal grandfather's only son Þ my father
Daughter of my paternal grandfather's only son Þ daughter of my father
\ Daughter of my father Þ My sister
Brother of my sister Þ My brother
Ans: 4
4) Only daughter-in-law of my mother Þ My wife
(statement is given by a male)
\ Mother of only daughter-in-law of my mother Þ Mother of my wife
Mother of my wife Þ My mother-in-law
\ The woman in photograph is Rohit's mother-in-law.
Ans: 4
(5-6):
U is the sister of S Þ U ____ S
S is the son of Y Þ Y
S+
\ U is the daughter of Y Þ
Y
S U
+ -
Y is the only child of D and D is married to X Þ
D Û X
Y
D is the sister of P Þ D ____ P
\ X is a male
Now combining the relations
X Û D ____ P
(+) (-) (?)
Y
(?)
S U
(+) (-)
5) If 'T' is daughter-in-law of X, then 'T' should be the wife of Y and hence the mother of S.
Ans: 3
6) 'D' is the mother of parent of 'U'. Therefore D is the grandmother of U.
Ans: 4
(7-11):
T is older than V but younger than U
Þ T > V and U > T
\ U > T > V
P is mother of Q and R is sister-in-law of P.
P Û ____ R
- + -
Þ P, R > Q
Q
T is the daughter-in-law of S and S is eldest member of family.
S
Û T
+ -
U is the father of only R and V. Therefore V got married to P.
U
+
P Û V R
+ -
Q
U doesn't have any sibling means U should get married to T.
S
U Û T
+ –
P Û V R
- + -
Q
-
R is older than V
Þ S > U > T > R > V > P > Q
\ T = 54 Q = 4
7) If Q + V = 31 Þ V = 31 - 4 = 27
S > R > V
Þ 54 > R > 27
The possible value of 'R' from the options is 30
Ans: 5
8) T = 54
P = 24
\ P + T = 78
Ans: 2
9) T is the grandmother of Q.
Ans: 1
10) If M is married to S, S is the husband (As S is eldest in the family) and M is the wife. Hence
S is the grandfather of R
Ans: 3
11) Both P and Q are younger than V
Ans: 4