I am sorry for your loss.
You should get an EIN for the estate (if you do not have one) and report the sale on Form 1041 ( LINK }, not on your father's final return for 2023. You might want to seek professional help in that respect.
The expenditure of your personal funds is not material since you are the only heir and likely only beneficiary. However, the expenses could be deductible if made in connection with the house in terms of selling expenses, administrative expenses, or increasing the basis of the property.
You also might want to get a date of death appraisal from a licensed real estate appraiser.
