Should the sisters' share be calculated from the entire gift given by the father, or from what remains of the land after selling a portion of it?

It is not permissible for a father to deprive some of his children of a gift; rather, he must treat them equally, for the Prophet, peace and blessings be upon him, said: "Fear Allah and be just among your children." He must be advised to reclaim the money and redistribute it, or to give the daughters what he gave the sons.

If you give your sisters their share of what your father specifically gave you, your conscience will be clear, and you should give them from the entire share you received. You should also advise your other brothers to follow your example and include their sisters in what their father gave them.