I need advice from a third party.........?

3 years ago I was evicted from my house. My sister built a room into the garage and that's where I've been living since then. The house now belongs to my adult niece. They have keys to my room and go in any time they want. I pay 800 a month to live in this room. I've only been late paying rent once. I've been accused of everything from stealing from my great nephews piggybank to god knows what. Recently my sister (not my niece's mom) told me that my niece told her that my son was trying to get the other kids to show them their privates. Funny thing is no one ever said anything to me. I asked my son about it and he said it never happened. I took him to a third party (counselor) and they believed he didn't do it either. My kids will be playing in the water and her kids will take the hose from them. I say something and she just says it's her house and they can do whatever they want. More than once I've walked in the house and caught her and her current boyfriend smoking pot. It's gotten out of hand. She takes the knobs off the stove so I can't use it. She takes the racks out of the oven too. She even hides the effin can opener. So I bought an electric skillet, a convection oven, a gf grill, and a damn can opener. Then she started throwing my leftovers away. I'm literally living paycheck to paycheck and I can't afford to move. i'm not sure what to do. Every time I try to say something I get told that I'm being ungrateful. I'm not trying to be ungrateful at all. But I can't help but feel that although this might have started out as a way to help me that it has evolved into something different. Does anyone have any advice?3 years ago I was evicted from my house. My sister built a room into the garage and that's where I've been living since then. The house now belongs to my adult niece. They have keys to my room and go in any time they want. I pay 800 a month to live in this room. I've only been late paying rent once. I've been accused of everything from stealing from my