Because this is a substantial transaction I would suggest that you run it past the Court of Protection first and ask for confirmation that you are able to do what you plan to do. If your mother is in care, that should not be a problem. If the relationship with your sister has soured, I would not sell the house without court protection consent. You also need to keep a track of every single penny of your mums money because your sister will no doubt allege that you have taken money which you were not entitled to. Listen to the voice of experience!
If you sell the house, you can only use your mother’s money for anything which is for her benefit.
You can care for her but you are only entitled to give her gratuitous care and you are not entitled to be paid as a carer. It’s ironic that you can pay third parties but not yourself unit of the amount of money was the same.
You would not be allowed to use the money to expand your house but you would potentially be able to make reasonable adjustments provided they were only for the benefit of your mother.
Neither you your sister could have any of your mother’s money until such time as your mother eventually passes away.
I’m sorry, appreciate this is probably not the answer you wanted.
Can I clarify anything else for you?
I am happy to answer any specific points arising from this.
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