This is the case of Melita Jackson who died leaving nearly 500k to charities and nothing to her daughter who she hadn't spoken to much since she was 17 when she took up with a man she disapproved of. The daughter never seems to have worked and had 5 children with the man who was on a low income.
I don't understand how a woman in her 50s capable of working if she chose could get her mum's money contrary to the will.
I get on well with my dad but if he chose to leave his money to charity I would see that as his choice unless I suspected coercion.
I think only dependent children should be entitled to money.