[Amafeo]

My fiancé that I have been living with for the past 8 months and his sister's name is on house and he was in car accident and is needing rehab he wanted me to have power of attorney and told me that was my home. It was bought with his money but sister had to sign on it because of his credit. Now she is telling me to find another place to live. What are my rights because he wants me there but she tries to control him.

[Alty]

If the sisters name is on the deed, she owns the house. Doesn't matter that your boyfriend paid for the house, by law, if his name isn't on the house, he doesn't own it. Stupid mistake on his part. The sister legally owns the house.

Can she force you out? Yes, as owner of the house, she can. But she has to do it legally. She has to legally evict you, and she has the right to do so.

Have you been given an eviction notice?

[joypulv]

Question in addition to the correct response above: is there a mortgage on the house? If so, and he cannot make payments while in rehab, and she is responsible to the lender, then she is not being mean. She simply has to cover the mortgage. Have you offered to pay it?

[ScottGem]

However, if he is even a part owner of the property then she can't do this without his permission. And where is he on this? I understand he is in rehab, but is he mentally competent or what?

[AK lawyer]

and he was in car accident and is needing rehab he wanted me to have power of attorney and told me that was my home. ...

One can read this run-on sentence in one of several ways. If OP is trying to indicate that her "... fiance ... and his sister's name is on house ...", then OP can't be made to leave. Both brother and sister would have to be on-board with OP's eviction.

... sister had to sign on it because of his credit. ...

Again, unclear. She had to sign "on it". One might assume "it" would refer to the mortgage note.