No, I'm happy to answer on here - I name change quite regularly, so if people manage to work out who I am, they won't know much else (!).
And also, I'm reasonably comfortable talking about it now, which is one of the benefits of therapy. I do rather disagree with differentname, it was well worth paying for, simply because I'm not carrying it around with me any more, at least not in the same way.
I will try not to write an entire novel, just the outline...
My parents split up when I was 7 and I lived with my father (and my step-mother, but that's a whole other story). Like you, I will never know what really happened; my father 'persuaded' my mother that we would be better off with him, but he had a will of iron and she had no self-confidence at all so of course he would win that. I saw her reasonably regularly, but we don't have a proper relationship at all - as someone else said, I'm the adult, not her.
She's a depressed sometime alcoholic who lives in a very messy house which I refuse to visit now I have a child. She did have a terrible childhood, in a very detached upper-middle class way (and which would make a whole novel in itself), which does make me understand some of the way she has been. But I still find her very hard to deal with.
I stay detatched from her (she phones every week but only comes to see us about once a year) because otherwise I would be furious with her for not looking after me. But I can't be angry with her because she is so fragile (and I don't think that therapy has quite sorted that out properly in my head). I think two things upset me most; that she didn't look after us (living with my dad and step mother was far from plain sailing, esp for me) and there will always be a bit of me which thinks that not even my mother loved me enough to look after me. Which very easily - I am such a bad person not even my own mother loves m - converts into self-hatred if I am a bit down.
Depression makes her selfish (when my father died she rang up and her first words were 'Oh I am so sad'. She'd been divorced from him for over thirty years, he was my dad...); drink makes her muddled when she is drinking. I can't fix her, all I have been able to do is disentangle my messy emotions enough for me to live my own life.
Very interesting you said that it will be telling when her own mother dies - that's exactly when my mother fell apart completely.
Sorry, this reads a bit rambling and pointless, and possibly not very helpful, but do ask if there's anything else.