Cuñado

So awhile back I was in Wal-Mart with my mom and we were checking out. She saw some guys from her work who just so happened to be Mexican. One was an older one named Martin and a younger one in his 20s named Louis. So anyways I got tired of waiting to check out so I went to the car. The next day mom said that Louis asked how old I was, etc... Evidently he kept calling my brother (who also works with him) cuñado. My brother of course had no idea what it meant so he asked one of the other Mexicans what it meant. Turns out it means brother-in-law and that Louis has a crush on me. And still, he calls Ashton cuñado.