[quote=Jess_Is_God;7830]This is probably going to be long and confusing...

For the past 3 years my step dad has been cheating on my mom. Last summer, she found out about it, and they split up for a few days, and he promised it was over, and wanted to come back. I was pretty pissed off about it, but i got over it. This summer, he again, got caught cheating with the same girl. Again the same thing happened, he left for a few days, then came back. I didn't know why she let him come back. Then i went onto his facebook, and found some pretty bad messages between him and another girl. So i told my mom. this time he never left.

I have a younger sister, a 3y/o nephew (who is basically my brother since my oldest sister doesnt take care of him) and an older brother living in my house, along with my 2 parents.
My step dad has been acting like my sister's and nephew's best friend for the past few weeks. Telling my sister she doesnt have to to her homework, letting her stay up late, little things. And buying my nephew alot of new toys and Candy. He's also been ALOT nicer to my brother, and he normally treats him like shit. He's been avoiding me, because, i think, he knows he cant bribe me with anything. My mom also told me, because of some stupid laws, she can't make him leave. And she think's he's trying to get my brother, sister and nephew to like him better, so they can get joint custody, so he doesn't have to pay child support. Which would force my mom to sell our house, and she would lose alot of money.
She also told me that he has been calling her a bad mother, and putting her down alot, so she'll leave, and give him "the kids" and the house.
I hate this man.
It's getting to a point where my mom is so stressed, her blood pressure is extremely high, and she is at a serious risk for a stroke.
I feel like i need to do more to help...anyone have any suggestions or comments.
I think i covered almost everything...[/QUOT

I was in the same situation as you in high school, but my parents seperated and I go I was going through a self-destructive cycle.