Blood Relations Questions

Aryan has a brother named Bishnu. Aryan is the son of Chetan. Dev is Chetan's father. In term of relationship, what is Bishnu of Dev?

Introducing a boy, a girl says, "He is the son of the sister of my mother's brother." How is the boy related to the girl?

Introducing a boy, Sia says, "He is the grandson of my father. I have no siblings." How is Sia is related to the boy?

Introducing a boy, Amar said, "He is the son of my maternal grandfather's son." How is that boy related to Amar?

A & B are married couple. X and Y are brothers. X is the brother of A. How is Y related to B?

Pointing to a lady, Diwakar said, "Her mother's only grandson is my son." How is that lady related to Diwakar?

Introducing a boy, a man says, "He is the son of the brother of my grandfather's son." How is the boy related to the man?

Introducing a boy a Ankit said," He is the son of daughter of my grandfather's son". How is that boy related to Ankit?