P introduces K saying, 'He is the husband of the grand daughter of the father of my father.' How is K related to P?

Brother-in-law

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

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

   —   ⇒ single line shown "relation between them other than Husband & Wife".

   +   ⇒ Plus sign shown " Male".

   -   ⇒Minus sign shown " Female".

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So, K is the brother in law of P.