Jesus Christ :S What's with everyone's dad these days? My own has behaving quite nice lately but everyone else's seems to have gone completely bonkers. =/

*stops the stupid parents rant and hugs*

I don't know if this is an option or not but have you ever considered contacting social services? I mean... what he did to your sister was physical abuse, not to mention the mental abuse the three of you seem to suffer from. You wrote it yourself, you really suffer because of him and you shouldn't. =/