Yes, just because you are not on the mortgage, does not mean you do not own the house.
You say you are listed on the deed, so that would indicate that you are part owner of the property.
It sounds like you are in a similar situation as last year, just that the mortgage was refinanced in your brother's name only.
You can either-
Pay half the mortgage payments and claim half the Home Mortgage Interest (since you still have an interest in the house) Your brother then would only claim the remaining half.
or
Contribute to the household, whereas your brother pays the mortgage and claims all the interest.
Either way, you don't claim rent expense and he doesn't claim rent income.
The 1098 from the Lender does not need to list your name for you two to split the interest.
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