Long term capital gains on property inherited by three individuals

My mother and her two Siblings were left a piece of property they are fixing to sell. My grandmother inherited it from her parents, she passed and left it to her kids. It is vacant land and has been over a year since she passed. It was never divided up in acreage, they are fixing to sell it. What would the taxes be on it besides long-term capital gains and how would they go on the appreciation of it since the property is so old.