You can fugetaboutit.
A portion is only him contributing to household expenses. Add up total expenses and divide by the number of occupants. That would be considered his share of household expenses.
The rest is either care giver income or a gift from him. You get to decide which, because it's family. Since the annual exclusion of $30,000 ($15K to you and $15K to your spouse) is not exceeded, a gift tax return is not required.
