=(
I wouldn't be able to walk away either. I can sympathize in the sense that I absolutely love my dad and I don't care much for my mom (but she's not a terrible person, just really annoying). So I'd be the same as you, I wouldn't be able to leave my dad behind like that.
I guess the only thing you really can do is try your hardest to find a good job to help him out. It sucks no matter what.
Or maybe formulate a plan to... get your mother out of the picture >_>
--
~Halo Rolling around at the speed of sound.
http://img593.imageshack.us/img593/2417/sonicspeed.jpg