Looking at one person, a woman said, "His brother's father is the only son of my grandfather." How is the woman related to that person?

X and Y are brothers. R is the father of Y. S is the brother of T and maternal uncle of X. What is the T to R? 

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?

A is B’s sister. C is B’s mother. D is C’s Father. E is D’s mother. Then how is A related to D?

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?

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

‘A+B’ means ‘A’ is the brother of B’.‘A-B’ means ‘A’ is the husband of B’.‘A×B’ means ‘A’ is the mother of B’.‘A÷B’ means ‘A is the sister of B’. If P+R÷T-K×O×C, then how is P related to O?

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?