It's Relative

A couple who's been married for over 20 years were having a fight in the car during a trip for a holiday. After arguing for a moment, they decided to quit talking and silence ruled.

Then after a few minutes, they passed some pigs in a farm, all making those horrible noises I don't know what they call it. Anyway, the wife looks at her husband and gives a sinister grin and says, "Relatives of yours?"

The husband replied "Yep, in-laws."