Vinod introduces Vishal as the son of the only brother of his father's wife. How is Vinod related to Vishal?

Introducing Sonia, Aamir says, "She is the wife of only nephew of only brother of my mother." How Sonia is related to Aamir?

Introducing a man, a woman said 'His mother is the only daughter of my father'. How is the man related to the woman?

Pointing to Falguni, Hardik said, "The son of her only brother is the brother of my wife." How is Falguni related to Hardik?

Pointing to a man in a photograph, a woman said, "His brother's father is the only son of my grandfather." How is the woman related to the man?

Gopi said to Vivek, "That person is the father of the only brother of my mother." How is that person related to Gopi?