Praise be to Allah, the Lord of the Worlds; and may His blessings and peace be upon our Prophet Muhammad and upon all his Family and Companions.
The inheritance of your father should be divided as follows:
The wife gets one eighth of the portion. Allah Says (interpretation of meaning): {…but if you leave a child, they get an eighth of that which you leave….}[4:12].
The mother gets one sixth of the portion. Allah Says (interpretation of meaning): {… For parents, a sixth share of inheritance to each if the deceased left children; ….}[4:11].
The rest should be divided between the sons and daughters: the male gets 2shares and the female gets one share. Allah Says (interpretation of meaning): {… Allâh commands you as regards your children's (inheritance); to the male, a portion equal to that of two females; ……}[4:11].
Therefore, it becomes clear that every member of the heirs has a portion of the land according to his share of inheritance and can then sell his portion with whatever price he wishes and it does not have to be a given price, whether the price of purchase of the land by the heir or its price on the day of the division of the inheritance.
Allah knows best.