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 many nephews does F have ?

A. Nil
B. One
C. Two
D. Three
Answer: C . Two


Clearly, F is the maternal uncle of D means F is the brother of D's mother i.e., F