Everyone came to the wedding, including a distant 'cousin' no one had heard from in years.
He's her 'first cousin'. = He and she are 'first cousins'.
He says politics and show business are 'kissing cousins'.
(..) Nice going. You ever think of running for class president? MARTY: Chuck! Chuck, it's Marvin. Your cousin, Marvin Berry? You know that new sound you're looking for? Well, listen to this. Lorraine. Marty, that was very interesting music. (..)1985 Back to the Future