I am not allowed to do calculations but the basis of a gift sold at a gain would be the doner's basis. In Montana the spouse would get a stepped up basis for the house when the Father died, so the original basis would be the $165,000. It would stay at that, adjusted for percentage of ownership, until sold as all you mention after the father died are gifts.
If the house was the primary residence of the decedents when sold, you would report the sale in the Wage and Income section of TurboTax and then Less Common Income, then Sale of home (gain or loss.) Otherwise, you would report it as an investment sale as follows:
You enter investment sales in the Wages and Income section of TurboTax, then Investment Income, then Stocks, cryptocurrency, Mutual Funds, Bonds, etc... Skip the section where it asks if you want to upload your tax documents. Choose Other for the type of property sold. When you come to the screen where you report the sales proceeds and cost basis, for the type of property sold, choose Land (personal use) or Land (other investment purposes), depending on whether there was personal use or not.
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