Broken family

This post is kinda continuing from my last one. To summerize, it was about my younger sister. It is clear that she has the whole different life online via facebook and whatever. She talks to who knows how many people from who knows where and who knows how old they are. She does crave attention, which I can relate with, but she does take it to the extreme. This time was a little too extreme. My step mom recieved some pictures on to her phone of some guys junk. She found out that it was my sisters friend/boyfriend, not from around here. Her along with my dad tried talking to my sister about it but she just remained quiet. They got the police involved, he tried talking to her. After he left, my dad tried taking the phone away from her. There was a struggle and he kicked her in the stomach. She panicked and ran outside screaming and crying. Luckily I was there to cool things down. My dad use to beat me as a kid but has never laid a hand on my younger sister. I know he didn't hit her very hard and she is very overdramatic, but I'm sure it did scare the hell out of her. After all, my dad is a huge 6 foot 2 scary mexican. Pretty intimidating. Things were just okay for the rest of that night. The next night I was away at my boyfriends house. My dad has some friends over for some drink, nothing out of the ordinary. My step mom gets some more text. Not as horrifying as the last, but still upsetting. They were already pretty buzzed by then and all sort of ganged up on my sister. This time I wasn't there and she ran away. When the police found her, she told them that dad hit her. He admitted and they arrested him. My mom had to drive out here at 4 in the morning from a mile away, rented a hotel, and stayed with my sister. Through her text messages and facebook, we realize that she's been saying some pretty hurtful and untrughtful things about everyone, particularly my dad. I won't say exactly what it was she said, only that it's a complete lie and it would ruin my dads life forever if she decided to tell the police. Her friend was texting how she should get the sharpest knife in the house and kill my dad. They're keeping the cell phone as evidence for either going after this kid or whatever, I'm not really sure. My step mom and I were never close at all. We lived together, but completely avoided eye contact and conversation. She was a complete mess, and I comforted her, along with my mom and my little sister. I've been acting as the strong supportive one, but really I myself am a complete wreck and just want to hide and cry in my room all day. Today (three days after my dads arrest) we went to the court house to get my dad. it took eight hours of waiting. When we got him, I was so overwhelmed I hugged him and cried. Now that he's home, he want absolutly nothing to do with my little sister. She can't live with my mom because my mom is right now living with my grandma and grandpa who has worsening demensia. I've tried telling my dad he can't just completely remove her from his live, that's his daughter. He doesn't care. I understand he is incredibly hurt and that's why he's probably saying this. But I know my dad and he's so stubburn that he might just go through with removing his youngest daughter out of his life. I feel so guilty cause I keep thinking if i was there that night she ran away, maybe I could have stopped her and this whole mess could have been avoided. My step mom is looking for boarding school, so that is an option. Still doesn't fix this broken family. I'm in the constant state of agony and I just want it all to end. I'm sorry this was really long, even if no one reads it or I get no response, it was just nice to get this all out.

Hi Pipgirl3000, I responded to your other same post, I hope that it's helpful. Please know that I am here for you.