X is husband of A. R is the only grandson of Y, who is wife of B and mother-in-law of A. How is X related to B?

Son

↑ or ↓ ⇒ Upward or downward line shown "generation gap".

   =    ⇒ Double lines shown "relation b/w Husband & Wife"

   —   ⇒ single line shown "relation in same generation other than Husband & Wife".

   +   ⇒ Plus sign shown " Male".

   -   ⇒ Plus sign shown " Female".

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ATQ,

Option 2 is correct.