Thank you for your question
My name is Clare
I shall do my best to help you and I need some further information first
When is her move to a care home expected?
Your brother will gain no rights on the property.
If your mother does go into a Care Home and you need to sell the house then you will be able to give him "reasonable written notice to leave" and at the end of that time change the locks - and call the police if he tries to return.
I hope that this is of assistance - please ask if you need further details
You are most welcome - I hope all goes well