I have an identical question on This Money, a copy of the answer below. As long as he does not sell the house during her lifetime and it has been disregarded from her assessment he will be okay.
Janet Davies, of care home fees planning firm Symponia, says: 'As you quite rightly say a person’s home is disregarded if a relative over 60 lives in it. So providing that your mother’s home is your main residence and you lived there (and only there) for a while before she needed formal care, then it should be excluded.
'Your comments about your mother already being in receipt of local authority contributions would suggest that this is the case. This key fact should have been documented in the letter confirming the outcome of the assessment and the contributions.
'If the property is subject to the disregard it will continue to be excluded whilst it remains your main residence. If however you sold it during her lifetime, then the proceeds would be included in her assessment from the completion date and she would stop receiving any contributions.
'After your mother’s passing the house and/or its value will form part of her estate, and how this is treated thereafter will be determined by the details and wishes set out in her will or by the laws on intestacy if she doesn’t have a will.
'Sorry if this sounds obvious, but once your mother passes, she will no longer need care and the need for the Local Authority to provide funding will cease. There should be no need for you pay back any of the money contributed by the council.
'The only exception to this will be if the property is actually being included in her assessment and the council are offering the “deferred payment scheme”. If this is the situation then yes, the all monies paid out towards her care would need to be repaid after her passing.
'From what you have said the latter is unlikely to be the case, but it will be worth double-checking with the social worker to put your mind at rest.'