I heard that the other home was in his mother-in-law’s name. Senior community. I believe that he could be on the loan and get the deduction. My recollection is that the IRS doesn’t care who gets the deduction (owner or otherwise) as long as it’s not two different people.
Does FL have an income tax? I know they have real estate/property taxes. How does his deduction for real estate show up on his IRS forms ... if he files?