Only once when we first moved here 3 years ago we'd taken the living room door off which leads to the hall stairs front door whilst decorating say in the front room one night large window at the side...
Personally I'd go seek help from a professional and let them deal with your mum and pus find it a lot easier to talk about you're issues with them too :)
I think I may be being haunted for the past year whenever I'm near the kitchen my kettle clicks as though it's just boiled when it clearly hasn't I. Go upstairs there's a noise of a computer shutting...