Cousinauntoruncle?

I've been thinking a lot about the crazy relationships that can pop up from marriage between families. I mean, what would you call your sister-in-law's brother? Or her parents? And if there were two families and Abby married one of the sons and then Levi married one of the older children's children than his brother-in-law would also be his uncle! And what are your cousin's children to you? Second cousins or first cousins once removed? I mean--it's nuts. Especially when you start dealing with large families that can span a generation or two at least. :D This video is hilarious and pretty much sums up the whole, confusing cousin-deal. :P