'A @ B' means 'A is the husband of B'.

'A & B' means 'A is the father of B'.

'A # B' means 'B is the son of A'.

If S @ T # P @ Q # R & V, then how is T related to Q?

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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