‘A ∞ B’ means ‘A is the sister of B’.
‘A * B’ means ‘A is the mother of B’.
‘A @ B’ means ‘B is the father of A’.
‘A # B’ means ‘B is the wife of A’.

If V ∞ U @ W # Y * Z, then how is V related to Z?

Sister

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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