If X × Y means that X is the father of B, X ÷ B means that X is the mother of B, X - Y means that X is the brother of Y then which of the following expression shows that A is the father of C?

A × B − C

Checking from the options, we get the answer from option (iv): 

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

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".

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