Blood Relations Questions

P is the brother of Q. Q is the brother of R. P is the son of S. Based these three statements, much of the following statements cannot be definitely true?

Poonam told Akshay that "Yesterday she defeated Akshay's only sister's daughter Sneha in a school Taekwondo competition." How is Akshay related to Sneha?

Mathur's uncle's daughter's brother is Salmi. How is Sonm related to Mather? 

A lady said that father of Rahul's father is my father. How is the lady related to Rahul?

Showing a man on the stage , Rita said , " He is the brother of the daughter of the wife of my husband . How is the man on stage related to Rita ?

Pointing to a boy in a photograph, Rani said "His mother's only daughter is my mother". How is Rani related to that boy?

Ruby, Vishal's sister, has a son Jitendra and a daughter Sakshi. Priya is the sister of Jitendra's mother. How is Sakshi related to Priya?

Introducing a girl, a man says, "She is the daughter of my father's daughter". How is the girl related to the man?