A + B means 'A is the father of B'

A - B means 'A is the mother of B'

A * B means 'A is the sister of B'

A % B means 'A is the husband of B'

If A % B - C + D * E, then how is A related to E ?

Father's father

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".

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