Consider the information below:
Pointing to a girl, Sam said, “She is the only daughter of my mother-in-law.”
If we analyze the information provided above, we can infer that the girl is Sam’s wife. In Blood Relations problems, we figure out the relationship among different members of a family based on the information provided to us. To solve these problems, it is necessary that we have adequate knowledge of different relations in a family.
Let’s see some common relations in a family:
1. Grandfather’s or Grandmother’s only son: Father
2. Grandfather’s or Grandmother’s son: Father or Uncle
3. Father’s father: Grandfather
4. Father’s mother: Grandmother
5. Father’s son: Brother
6. Father’s daughter: Sister
7. Father’s wife: mother
8. Grandfather’s or Grandmother’s only daughter-in-law: mother
9. Brother’s wife or Wife’s sister or Husband’s sister: Sister-in-law
10. Sister’s husband or Wife’s brother or Husband’s brother: Brother-in-law
11. Father’s brother or brother-in-law: Uncle
12. Brother’s or Sister’s daughter: Neice
13. Brother’s or Sister’s son: Nephew
14. Uncle or Aunt’s son or daughter: Cousin
15. Mother’s Father: Maternal Grandfather
16. Mother’s mother: Maternal Grandmother
17. Mother’s brother: Maternal Uncle
18. Mother’s sister: Maternal Aunt
The best way to solve these problems is to create a Blood Relation Tree (Diagram to represent the relations) and then visualize the relationship between different members of a family. To do so, we represent the relations with the help of symbols.
Here, we have listed the symbols we have used in this course but you can create your own set of symbols as well.
1. A is a male:
2. A is a female:
3. A and B are married to each other:
4. A and B are siblings:
5. A is the child of B or B is the parent of A:
Let’s practice what we have learned.
Blood Relations Question 1: Q’s mother is the sister of A and daughter of B and D is the daughter of A and sister of P who is a female. How is P related to B?
C. Daughter’s daughter
D. Daughter’s mother
To solve this problem, let’s first draw the blood relation tree.
-> Q’s mother is the sister of A and daughter of B
We have represented Q’s mother with (-) since she is a female. We don’t know the genders of Q, A and B from this piece of information.
-> D is the daughter of A and sister of P who is a female.
This completes our blood relation tree as per the information provided in the question. Note that we don’t know the genders of B, A, and Q.
Clearly, P is the granddaughter of B. Since the gender of A is not known, we can’t say whether P is B’s son’s daughter or B’s daughter’s daughter. So, E is the only correct option.
Blood Relations Question 2: In Practice Exercise 1, how is Q related to B?
E. Data Inadequate
Blood Relations Question 3: Pointing to a boy, Rohit said, “He is the son of my grandfather’s only child who is a male.” How is the boy related to Rohit?
Blood Relations Question 4: Pointing to a man in the photograph, Nikita said, “His son’s mother is the daughter-in-law of my mother.” How is Nikita related to the man?
Let’s draw the blood relation tree:
-> Man’s son’s mother should be his wife.
-> Now man’s wife is the daughter-in-law of Nikita’s mother.
From the diagram above, we can see that Nikita is the man’s sister.
Blood Relations Question 5: Introducing a boy, Emma said, “His father is the only son of my mother-in-law.” How is Emma related to the boy?
Let’s draw the blood relation tree:
-> Boy’s father is the son of Emma’s mother-in-law
-> Obviously, Emma is boy’s father’s wife.
From the diagram above, we can see that Emma is the mother of the boy.
Blood Relations Question 6: Pointing to a lady, Neeru said, “She is the sister of my uncle’s daughter.” How is the lady related to Neeru?