I'm not speaking for Beta and Fiji chapters anywhere except my town.
But like I said...it's nothing official. Not even close. It's not voted on, or have anything to do with the actual chapter. Like lovespink88, it's not serious, and lots of people don't do it at all. I know an independent who is a "dad" of someone...so it's really not a big thing. And, we don't call our littles "daughters" in my chapter...although some other chapters do.
And yeah, we made a "family tree" because it was something to do...but it means nothing.
This turned into a big thing. I didn't mean it to. Thought it would be fun to talk about...I was wrong! haha.
I just want to repeat: it's not serious. It's like listing someone as your sister/brother on facebook...you can say it, but it doesn't actually mean anything.