In Relation puzzle type, mutual blood relations or other information of more than two persons are mentioned and information about any two is mentioned.

A is the son of B. C, B`s sister has a son D and a daughter E. F is the maternal uncle of D. How is A related to D ?

A. Cousin
B. Nephew
C. Uncle
D. Brother
Answer: A . Cousin

Justification: A is the son of B and D is the son of the sister of B.
So, A is the cousin of D.