Was or is?

I can't believe no one has send this, but I guess you're going to have to kill him, if you want to save her life. Or at least hurt him so badly he knows never to come around again. That's probably the better choice.

beat him down with a golf club, and let him know that if he is in fact not a changed man, that'll be the lightest of your assaults on him

You should track down that crazy ex girlfriend from the other FML and get her to give him a couple good whacks to his nuts. But seriously, that is really messed up. If your mom is going to marry him again after being pushed out a fricken' window, then I doubt you will be able to talk her out of it. Maybe you could somehow trick her into seeing a therapist and maybe they can help her?

Move out. If he took his rage out on your mom that way, its not long before he turns on you. Seriously, get the **** out, now.

Massive fail to her because she can't choose safety for not only herself, but her child, over her ex-husband. Changed or not, some things just do not deserve a second chance.

ouch! that's gotta hurt!

Haha, I'm sorry but your mom's kinda stupid.

DAYUM. you should let his parole officer know.

Keep away from him at all costs... Even if he says he changed, I wouldn't believe it. What kind of person pushes a woman our of a window?