Your 2001 cost basis was $37333.33. When you bought your sibling's share in 2012, the two remining siblings added $16,666.67. (1/2 of the 1/3 FMV at time of sale) so at 2020 sale date, each remaining sibling has a basis of $53,400.
Basis is the amount of your investment in property for tax purposes. Use the basis of property to figure depreciation, amortization, depletion, and casualty losses. Also use it to figure gain or loss on the sale or other disposition of property.
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