since your renting below fair value to a family member the treatment for income tax purposes is like it was a second residence. you do not report rental income or expenses
taxes go on schedule A. your deduction for all taxes is limited to $10,000
the deduction for its mortgage interest also goes on schedule A. depending on dates of the mortgage on the condo and home the deduction for mortgage interest may be limited. Turbotax will handle this if the proper info is entered. probably no more than the interest on $1 million in mortgages but if the condo mortgage is after 12/15/2017 the limit is $750,00 of mortgages. possibly even less if you refinanced the condo.
note that if you wait more than 3 years after moving out to sell, you'll lose the home sale exclusion.
that's because in the 5-year period ending with the date of sale both spouses must occupy the condo for at least two years in that 5-year period. if only one satisfies the occupancy requirement then they can get the exclusion only for themself. ($250K as of now)
