Deductions & credits

So the property belonged to my parents, they both passed away within 6mths of each other, without a will in 2014. We paid of the mortgage balance with the bank in Aug 2015. Do not have any closing documents. We paid the taxes on the property from the time we purchased it till it was sold, even though it was still in my parents name.  The property sat empty for many many years. I let my son move into the trailer for about a year, my brother moved in for a short time, he passed away in 2023 and my son moved  out the same year. The trailer was never rented out. We decided to sell in 2023 becuase it was just sitting empty. We signed with an agent but because there was no will the property had to go thru probate, and transferred into our names, before we could sell. Because the trailer was not  livable (per our real estate agent), we sold for land only. Both of us were over 55 at the time of sale. We never lived in the trailer. Thank You