I think your mom has what my mom had, and it made my mom very crabby too - a grown daughter living with them!

We were welcome when we were children - altho my dad did tell me that he only took care of me because otherwise they would take him to jail - but after a certain age we are guests in their home and really should behave the best we can, regardless of how mean they get, if we want to stay living there. My mother once farted in my face as she walked past me and laughed about it. I was sitting on her couch in her living room - i could not complain. But when i was able to leave, i left.