How much did she participate in the care of your late mother? Make sure you value that before you go too gung-ho on claiming what is rightly yours.
Two things here, yes she did look after my mum and dad a lot, but never a full time carer, she took them to hospital when needed and after my mum had the stroke arranged for her to go into a home.
I would have been more disposed towards sympathy had she not behaved so reprehensible from the outset. In fact her attitude made me question her motives.
Also, my parents moved to live near her when her children were very young, this gave my parents pleasure but also gave her the huge benefit of having free child care or assistance in anything else available at a moments notice for 20 years. She also had her parents in law living near by and they also helped out.
Personally I think she had those benefits and thus she had an obligation to care for them when they needed it, but tbh she still did the minimum she could. She was always a lot more interested in socialising and appearances than genuinely caring for people.
She also seemed to cut me out of key family events that I won't go into and seemed to make things as difficult as possible whenever she could.
I agree with the comments that she may have hidden some funds but life is too short and I'll leave that to her and her conscience.
A solicitor was never involved, apart from for conveyancing.
Basically the comments in here have largely confirmed my thinking which is good in a way. I consider myself to have been fortunate in life in the end (not lottery winning fortunate) so I don't want to create more aggro.