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'

A $ B means 'A is the son of B'

If P - Q - R * S $ T, then how is P related to T?

Mother-in-law

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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