Blood Relations | Science Olympiad for Class 3 PDF Download

Blood Relations

• Blood relations are all about family! It's the connection between people because they're related by birth. Like how you're related to your mom, dad, siblings, grandparents, aunts, uncles, and cousins.
• Blood relations are all about how people in a family are related to each other. It's like putting together puzzle pieces to see how everyone fits together in a family tree!

Basic Terms Used in Blood Relations 

• Parents: Mother and father.
• Children: Son or Daughter
• Siblings: Brother or Sister( of the same parents)
• Spouse: Husband or wife.
• Aunt: Aunt means father’s sister, mother’s sister, father’s brother’s wife, or mother’s brother’s wife.
• Uncle: Uncle means father’s brother, Mother’s brother, Father's sister’s husband, mother’s sister’s husband.
• Niece: Brother’s and sister’s daughter.
• Nephew: Brother’s and sister’s son.
• Cousin: Children of aunt and uncle.
• Father-in-law: Father of the spouse.
• Mother-in-law: Mother of Spouse.
• Sister-in-law: Sister of the spouse, wife of brother
• Co-sister: Wife of spouse’s brother.
• Brother-in-law: Brother of the spouse, husband of the sister
• Co- brother: husband of spouse’s sister.
• Maternal: Relations or family members who are from the mother’s side.
• Paternal: Relations or family members who are from the father’s side.

How to Understand Blood Relations

Learn Family Names:

• We should know the names of our family members, like mom, dad, grandma, grandpa, brother, and sister. It's like having a special club with people we love!

Understand Relationships:

• We need to know who is related to whom in our family. For example, mom and dad are our parents, grandma and grandpa are our grandparents, and so on. It's like having a big puzzle, and each family member fits into a special place!

Solved Examples

Example 1: A family consists of five members B, C, E, F, and G. C is the son of G but G is not the mother of C, E and G are a married couple. B is the brother of G. F is the daughter of E. Who is the brother-in-law of E?
(a) F
(b) G
(c) B
(d) None of these
Ans: (b)
With the given information we will draw the family tree.

From the family tree drawn, we get to know that the brother-in-law of E is B.

Example 2: A + B means B is the brother of A.
A × B means B is the husband of A.
A – B means A is the mother of B.
A % B means A is the father of B.
How is Q related to T from the expression "Q-P+R%T"?
(a) Grandmother
(b) Mother
(c) Aunt
(d) Niece
Ans: (a)
From the given information we simplify the expression "Q-P+R%T"
Q is the mother of P
P is the brother of R
R is the father of T

From the family tree drawn, we can say that the Q is the grandmother of T.

Example 3: Pointing to a man, a woman said, "His mother is the only daughter of my mother". How is the woman related to the man?
(a) Aunt
(b) Sister
(c) Cousin
(d) Mother
Ans: (d)
We trace the given statement backward; Woman’s mother has only one daughter, which means the woman herself. So the man’s mother is the woman herself and hence the correct answer is option D.