What kind of abuse are we talking here? Xander was clearly emotionally abused by his parents. Just look at the way he flinches when his father kicks the door open in Restless. That scene in itself was put there to show us that his homelife was abusive. Even in the commentary Joss mentions that Xander is looking for comfort in the dream "Some comfort, some love that clearly is lacking from his mother and his family life." His parents were portrayed as alcoholics who fight all the time. When Xander slept outside he was trying to avoid their drunken fights as Cordelia puts it. He even mentions it again in S7.
Xander being physically abused is debatable, some think he is from the quote in Nightmares "You obviously haven't played kiddie league. I'm surprised it wasn't one of the parents."
My mum cant tell who's calling from a voice. Shes great.
The scene was:
Xander: Hi, Mom!
Mrs. Harris: (off screen) Who?
Xander: (sarcastically) Xander.
As far as I know, Xander is an only child.
I hate hells bells so I dont watch it often.
The entire false visions, Xander's reaction to them, Xander sadly looking at his parents fighting while deciding whether he should marry Anya or not, Xander deciding he shouldn't marry Anya because he'll end up like his parents clearly show how his homelife affected him badly. If there was no abuse, if his childhood was sunshine and flowers, those visions wouldn't have affected him that much, now would they?
Maybe if I put it this way - if nick had a choice of his childhood or xanders, who do you think he would choose? Whos was abusive and whos was run of the mill?
Who's Nick? You mean Nicholas Brendon? I don't really know much about his childhood, other than him suffering from stuttering.
And either way, this is not a matter of compare and contrast: Xander was clearly affected by his childhood and his homelife and it shows in a lot of his lousy decisions: his inability to argue without throwing a fit, sabotaging his relationships, leaving Anya at the altar.