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'.
(..) Hey. What have you done with Grover? Grover? Grover's the least of your worries. What a surprise. If it isn't my two favorite cousins. Three. I'm a son of Poseidon, too. That's funny, because Poseidon doesn't have any other half-blood sons. I'm a Cyclops. (..)2013 Percy Jackson: Sea of Monsters
(..) to the depths of Tartarus. to exact his vengeance on Olympus, and the world. Only one half-blood child of the three eldest gods can defeat him. It all begins when two cousins grapple for a fleece... the son of the sea and the lightning thief. Luke. And that half-blood (..)2013 Percy Jackson: Sea of Monsters