P + Q means 'P is the father of Q'

P - Q means 'P is the mother of Q'

P * Q means 'P is the sister of Q'

P % Q means 'P is the brother of Q'

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

Father's mother

ATQ, 

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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".

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