Xander Theory

There was an interesting conversation in the chat room yesterday, taking about which characters might have siblings that we just don't know about. Spike seems like he probably had some sisters and possibly a much older brother who either bullied or ignored him. Cordelia is a good possibility for having siblings. And then there's Xander. I've always thought there was a good chance that he had an older brother who got the hell away from that nightmare of a family. Myrabeth had a realy fascinating and very plausible idea that he also had a younger sister. A younger sister who died at a young age. 

The theory fits and explains a lot of things about Xander and his immediate family. Myra is the one who came up with the theory, so I'll stop here and let her explain in greater depth. *leaves out Myra treats (a couple of huge thermoses of coffee) to lure her in*