A+B means ‘A is the husband of B’;
A-B means ‘B is the sister of A’;
A $$\times$$ B means ‘A is the mother of B’;
$$ A\div B $$ means ‘B is the son of A’.
If, $$ P + R \times T - Q \div S+U,$$ then how is P related to S?

A

Maternal grandfather

B

Father-in-law

C

Paternal grandfather

D

Uncle