I'll try to keep the background brief. My mum is an alcoholic and compulsive liar. My sister cut herself off from mum after a long and difficult relationship, they haven't spoken for a good 6 months. Mum has a history of mysterious accidents like riding her bike into a bus shelter, a mysterious car crash that she would give no details about (she doesn't drive) and various others.
Yesterday she rang me to say she fell off her ladders and has broken ribs, black eyes, bleeding on the brain etc. her injuries don't quite add up with how she was injured, me and DP have been wondering if she was beaten up. Anyway, I told my sister that mum was in hospital, now she's starting to think along the same lines as us that it doesn't add up, but she wants to get to bottom of it. She wants to come down today to find out what the real story is as she's worried mum could be in trouble with debt collectors, and that then would affect our inheritance.
Aibu to say not to come and not to start interrogating mum about her private life? I've learnt not to get myself to deeply involved with mum as she's such a head fuck you end up going crazy wondering what's the truth with her and it drives you mad. My sister is also quite volatile, a very strong woman who can be quite intimidating. My plan was just to support mum in hospital and help her get better, now my sister wants to me to try and sneak a house key from her so she can snoop round the house and try and find out the truth. I don't know what to do.