I'd be very grateful to hear experience or advice about how to retain boundaries/avoid self sacrifice when trying to help care for my elderly, recently widowed mother alongside a very difficult sibling in a way that minimises upset to our mother.
For context, my mother can do most day to day tasks for herself at the moment but cannot leave the house without help and needs a lot of help with household admin etc. Due to chronic health conditions she will definitely need more help over time. Currently I am doing all of the time consuming tasks (including weekly shopping, booking/attending many medical appointments, keeping on track of medication, household admin and organising her affairs after my father's death). I don't live nearby so do some of this from home and arrange my work/family around visiting her for at least one full day a week. Brother lives close by and pops in to check on her every few days but will not do anything time consuming. This is difficult for me but is manageable and I am starting to persuade mum to agree to some small changes to make better use of time for all of us (eg medication/shopping deliveries, paying bills by DD etc).I have started some discussions about finding out about possible external help for if/when she needs it and trying to help her to see this in a positive light (eg- if we organise another way to have some of the mundane tasks done, I will have time to take her out instead) and we've also discussed making some changes at home to help her be more independent. There could easily be a solution that we could all work with, at least for a few years.
The problem is that my brother is used manipulating our parents in to doing whatever he says, including doing a lot to help him even when they were not really well enough. He now expects that I will do the same so as well as helping mum he is putting pressure on me to do more to help him (including committing to regular child care, running errands etc). He also gets annoyed about changes I have made to make things easier and frequently tells mum that she should not have external help as 'family should look after one-another'. He is verbally aggressive when I disagree with him or say no to his demands which upsets mum. I think that his idea is that if he makes things unpleasant for me and upsetting for mum I will have no choice but to do as he says. Obviously this is distressing for mum. Whenever he has an outburst in front of her he calls in to apologise the next day and tells her how hard his life is (just general parenting/adulting stuff that we have all had to do). She always calls me afterwards to plead his case and ask me to 'just consider' doing more for him because she just wishes she could make things easier for him and she wants us to all get along. I have tried reasoning with him when he is calm but he is adamant that he is only asking me to do 'what any normal sister would want to do'. He has hinted that his stance on having external care for mum is essentially a bargaining tool- if I do more for him he will 'let' her consider this. Quite frankly if it were not for mum I would have absolutely minimal contact. But for now I am trying to find a way to make things more pleasant for mum and get her the care she needs without having to agree to give up what small amount of time I have left to myself.