We did something similar when my mum was diagnosed with vascular dementia. She had a decent pension plus state pension but her house was part of her deceased husbands childrens estate. Took advice from her doctor, her solicitor and bank manager and basically rinsed her accounts ( savings and stocks and shares ) and liberated cash as gifts and ' shopping ', we had to do it before she progressed further with the desease so as to not look suspicious to the council. I hated doing it as I felt we were taking from mum and should she go into care, any costs for care home...I explained to her at every stage what we were doing, even though I knew it wasn't sinking in but as her son and having POA it was all I could do. Her answer to it was that it would be yours and your sisters anyway so deal with it now.....Care homes for dementia patients are a bit scarce round here so we had the full package and care allowance for her, I didn't want her to go into care if I could avoid it. Previously we had lived in Spain and I was flying back every 7 - 10 days for shopping and generally sorting things out until we moved to within 150 yds away of her. She passed away in the comfort of her own home and her ashes, together with my step dads, were sprinkled in the brook next to her house.
A truly horrible desease