C is the mother of A and B. If D is the husband of B, then who is D from C? 

Introduction a boy, a girl said, "He is the son of the sister of my mother's brother." The girl has no real brother. How is that boy related to that girl?

Kitty said, “Uthara is one of the two daughters of my mother’s brother’s wife”. How is Kitty’s mother related to Uthara’s sister?

Pointing to a boy, Roli said, ‘he is the son of my grandfather’s only son-in-law’. How is Roli related to that boy?

Pointing to a woman, I said that her brother’s only son is the brother of my wife. How is the woman related to me?

Akhil is the maternal uncle of Rashmi. Ramesh is the father of Rashmi. How is Ramesh related to Akhil?

M is the son of P, Q is the granddaughter of O, who is P's husband. How is M related to O?

Amit and Sohan have two brothers Manju Sohan and Amit's sister who has a son Ravi. So tell me how is Ravi related to Amit?