My grandma used to say, "If it weren't for those d@mn powwows, then you wouldn't have to worry about getting your babies enrolled!"
I had mentioned, too, that when I went to AK I didn't meet someone that I wasn't related to, and alot of those Nativez that were livin up there were all married up with people from the same clan and everything. Stirrin up sh*t with their grammas and what not that way.
But they have a serious system, as with alot of tribes, with clans and relatives and what not. Though very intricate and complex, these are the most profound and ingenious systems of maintaining relations and keeping people from incest, yuk.