U $ V means 'U is the sister of V'
U @ V means 'U is the husband of V'
U * V means 'U is the son of V'
U ÷ V means 'U is the mother of V'
If O $ P * B @ F, how is O related to F?
Answer & explanation
Correct answer: option 3
ATQ,

*********************************************************
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".
*********************************************************