Blood Relation Test - General Questions

A's brother B is the son of C. D is C's father. E is D's wife. How is A related to E?

Pointing to a man, Neha said, "His only brother is the father of my daughter's father." How is the man related to Neha?

Rohan's mother is the only daughter of Kamala's father. How is Kamala related to Rohan?

A's mother is the sister of B's father. How is A related to B?

If A + B means A is the father of B, and A − B means A is the sister of B, what does P + Q − R mean?