Hi Bohu,
Thank you for the question.
You did not specify how you might become a joint owner of a family home, here are some scenarios:
1. via purchase as main home or second home, you can deduct mortgage interest on a foreign main home or a second home if you itemize the deductions (Schedule A). Foreign property tax is not deductible. What you pay is the cost basis in the event of future sale.
2. via gift. same comment as 1., except your cost basis is the donor's adjusted basis, if the fair market value is more than the donor's adjusted basis. Form 3520 reporting may apply. Please consult local professional.
IRS Pub 551, Basis of Assets, page 9
https://www.irs.gov/pub/irs-pdf/p551.pdf
3. via inheritance. same comment as 1. In general, you may receive a step-up basis due to death at the date of passing. Form 3520 reporting may apply. Please consult local professional.
Hope the above helps.
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