Read the following coded relationships: A4B means A is the mother of B. A3B means A is the father of B. A5B means A is the son of B. A7B means A is the daughter of B. In the expression P4Q3R7S, how is S related to P?

Pankaj (Male) pointed to a girl and said, 'Her paternal grandfather's only son's wife is my mother.' What is Pankaj's relation to that girl?

A + B means 'A is the wife of B'; A - B means 'B is the daughter of A'; A × B means 'B is the brother of A'; A ÷ B means 'A is the father of B'. If P + R × T - Q + S ÷ U, then how is P related to the mother of U?