You and your sisters need a tax pro. It's complicated due to your interest and the inherited portion.
BTW, your sisters inherited their shares on the date of your father's death not the date of the deed transfer.
Is the property rented now? Is the property available for rent? That makes a difference.
Depreciation deductions for 2024 are taken AT LEAST through the end of the 2024 rental period.
The $15k improvement is added to basis BUT is NOT depreciated unless the property was rented or available for rent at the time.
Sorry for your loss.
