I think you are saying that you have a second home and a family member is contributing to the house payment, mortgage interest and real estate taxes. I assume that only you are an owner of the real property and the other family member is not?
If this is the case, you would be able to deduct that portion that you paid on form 1040 Schedule A. That portion the other party paid would not be reported since that party is not an owner of the real property.
See this TurboTax help. See the last option.
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