10 point! please help! crazy roomates?

Me my bf and my baby are staying with my bfs sis bro inlaw and their three kids 1,5,and 10. They never ask me to baby sit but they leave them with me and they keep telling me they will pay but they never have sents I started 2 monthes ago. the house is always dirty so I clean every day and they never say thank you. The 1 year old crys for everything, bcs his mom gives him everything so I make him say please and thank yous. The 5 year old doesn't like do what he wants and never listen to enyone so I give hime time outs. I know they arnt my kids but sents she never ask me to babysit I do what I want with them. When I'm in my room with the door closed they just open the door its like what if I'm changing or we're having . So many things bother me but its too much I just rote the basics what do I do should I tell them to please knock the door should I encorege time outs when they are around should I not clean up there mess do I make her pay me or should I not let them take advantage of me bcs I have things I need todo but I can't with thair kids and I have my own kid to take care of and yes we pay rent! Please help I know this doesn't sound like much but I'm going crazy. And I know everyone know its hard living with roomates but I need some help we are gonna be satying her for 5 more months I I need. To change some of this