Questions about getting a minor out of a toxic home.?

Ok, I need some advice, and I wasn't sure where to put this, but put it here bc I need to know some legal stuff and it gets high traffic. My nephew is 17 and he is a really good kid, but he is in a really bad home situation. My sister and her husband ( his step dad) are emotionally abusive to the kids. My niece can move in with her real dad if need be, but my nephew has nowhere to go. They keep telling him how worthless he is and how he will never amount to anything. Also he needed surgery at one point on his foot and needed dental work done and instead of taking care of that my sis got a boob job. He's not allowed contact with me (my sister disowned me and my brother two years ago saying we were bad influences) but he managed to get my cell number and even came out to the house today. He will probably be in a lot of trouble later, though, because they punished him for speaking to me at christmas this year. He became really depressed about it a while back and tried to drown himself but his friend saved him. He told his school counsilor who told his parents who told him to grow the **** up. He wants to move out. He can't live with us, because laurens mom woulndt let her stay with us with a teenage boy in the house. He can't get an apartment bc he is only 17 and wants to finish high school. Is there a way he can be emancipated in Texas without already living somewhere else and be supporting himself? Would a judge grant him emancipation from his parents when the only proof of his abuse is conversations with his counsilor and a cop? Is there financial aid for emancipated minors? How can I help him? I really want to see him finish high school and get into the fire academy (he wants to be a firefighter) and see him get into some therapy for his depression. He is such a good hearted kid. Any suggestions or advice would be greatly appreciated.