OP
Please read my post
Firstly, ignore the goady threads. It is clear to
me that you are not a scrounger - simply someone who doesn’t understand the system and is trying to work out what to do morally and legally in order to support you and your disabled children.
Firstly, you are a warrior - lone parent to two severely disabled children, recently divorced , (does their other parent also provide care to his children??), mum with dementia, working - that is a lot.
I would use 50 k of your lump some to pay down your mortgage and then clear your CC debts. Keep the rest as savings for now and try and see if you manage on your income then. However, it is likely that you will run out, bar the allowed 6 or 8k - and then it is not morally wrong to apply for benefits to which you are entitled.
regards a wet room - I would look into charities that may provide grants for this - maybe ones specific to your childrens conditions, but there are all sorts of charities - eg ones that consider grants to ex teachers, Jewish women, etc etc. I think there are websites where you can search, or ask chat gbt.
Finally, have your children had an assessment from social services children’s disability team? They are entitled to that and you are entitled to a carer’s assessment. Definitely worth tapping into to see if they can provide any practical or emotional support and advice. Your children should be considered children in need - it can be really helpful to have a SW as a care coordinator so that different agencies can work together. As a Social Worker, much of my role involves advocating to ensure people were accessing relevant support from the NHS and education. Have a look at the Children Act in relation to disabled children and the Social Services Health, wellbeing and care act in relation to this.
Good luck and I hope life gets easier.