Thanks all. Sometimes writing it all down helps. It's also helping put it in context that it wasn't all my fault.
It's all been a bit shit anyway but it's the bit with my mum that makes it really unpleasant.
My sister had terrible mental health issues and was an alcoholic. I few times I asked my Mum to just leave her alone as Mum would call her, rile her up and then she'd start drinking. Mum would say she wasn't going to stop calling her daughter. In a way they sort of fed off each other and there was endless drama.
She'd also phone me up and complain my sister was "uncaring" if she didn't pay my parents enough attention. Looking back it was such odd behaviour when my sister was obviously very seriously mentally ill.
After my sister died my Mum started complaining about me behind my back and I'd get texts at all hours about Dad - I remember early one morning on my daughter's 4th birthday that briefly mentioned my daughter then was basically a big message about my DF. I felt really conflicted for thinking it but part of me was so upset I couldn't just, for once, focus on getting my little girl up and ready. Obviously if you ignored these you were being a bad daughter.
If I got her to stop one form of intrusive behaviour - I asked over and over to not send me the early morning texts - then it'd be replaced with something else. For a while it her calling and getting me to speak to Dad - he couldn't really speak by this point, she refused to give me any warning of when she was going to do this, and I'd be taking the kids to the park, see the call and pick it up in case it was an emergency, then be really struggling to hear my Dad string a few words together.
I ended up seeing a counsellor and reducing contact. This worked for a while and I felt a lot better, but I've been feeling bad since the last awful visit I had to my Dad - he seemed in a lot of discomfort - combined with my Mum starting a new angle of trying to get herself involved with a project I'm doing at work (argh!), sent a photo of Dad sitting slumped over in a chair looking dead then did that weird shit with posting a card through the door when I was out.
Anyway I've e-mailed the counsellor again and will hopefully get some more sessions soon.
Sorry for the rambling, it just has been really hard. Hoping better days are ahead.