Around here, there is a good chance you're related to almost everyone... (if you're Navajo, that is).
So if someone is "interested" in someone else, they try to find out which "clan" they belong to, to prevent lots of heartbreak and angst in the future (i.e. finding out you're dating your cousin...)
So Marty today was asking all the girls in class which clan they were in. And then he turned to me -
"Miss Johnson, what's your clan?"
-"Thompson," I replied. "And sorry, Marty, you're too young for me."
Yes, I said that. :)