While introducing a man to her husband, a woman said his brother's father is the only son of my grandfather. How is the woman related to this man?

A said "that boy is the grandson of my mother's husband. I have no brother or sister." How is the boy related to A?

Anil introduces Prashant, "He is the husband of the grand daughter of the father of my father". How is Prashant related to Anil?

If A is the husband of B, C is the brother of B, and D is the son of C, then how is D related to A?

If A is the father of B, C is the mother of D, B is the brother of C, and E is the son of D, then how is A related to E?

If A is the father of B, C is the mother of D, B is the brother of D, and E is the son of A, then how is E related to C?