Get your taxes done using TurboTax

3 siblings have inherited their fathers estate.  Siblings no longer communicate.  Property was sold at a loss.  We have received a 1099s for our 1/3 of the sale. Trying to determine FMV fair market value.  Is it kosher to use the purchase price from about 5 years prior if available?  Or what else.  first listing price?  how does one set the FMV?

Thank you for your input.