F + M means 'F is the husband of M'

F ÷ M means 'F is the daughter of M'

F - M means 'F is the father of M'

F × M means 'F is the mother of M'

If U + V × K - B, then how is U related to B?

Paternal grandfather

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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