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

Maternal grandfather

ATQ,

*********************************************************

Please note:

  l   ⇒ Vertical line shown "generation gap".

 =  ⇒ Double lines shown "relation of spouse" 

—  ⇒ Horizontal line shown "relation in same generation other than spouse".

     ⇒ Rectangular box shown " Male".

     ⇒ Circular box shown " Female".

*********************************************************