In Relation puzzle type, mutual blood relations or other information of more than two persons are mentioned and information about any two is mentioned.
1. A is brother of B.
2. C is brother of A.
3. D is brother of E.
4. E is brother of B.
Then uncle of D is
Clearly, D is the brother of E and E is the daughter of B.
So, D is the son of B. Also, A is the brother of B.
So, A is the uncle of D.