Pointing to a photograph, A said to his friend B: 'She is the only daughter of the father of my mother.' How is A related to the person in the photograph?

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?

Pointing to a photograph of a girl, Rajan said, 'She has no sister or daughter but her mother is the only daughter of my mother.' How is the girl in the photograph related to Rajan's mother?

Pointing to a man, a lady said 'His mother is the only daughter of my mother'. How is the lady related to the man?

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

Mukesh said to his friend, "Rita is the mother of my son's wife's daughter". How is Mukesh related to Rita?