Distributing a building, which was granted during his lifetime to some of his children, amongst all the children after the father's death to free ones

Q 1: My father passed away and he had divided (Part No. 16; Page No. 237) his estate before his death between his children; three boys and three girls. He had granted to each of his sons - before dividing the farmland and houses - land on which we could build houses for ourselves; and each of us has built a house for himself and his children. Do our sisters - who are all married now - have any right to the houses that each of us has built and live in at his own expense, with no involvement from our father’s money?The question, in brief, is: Do our sisters have any rights in the land that was given to us by our father during his lifetime, upon which we have built houses, as I mentioned, from our own earnings?

A: If your sisters have agreed to this proceeding, there is no sin against you, but if they have not, it is obligatory on you to give them their right to a share in the land according to the rules of inheritance, with the males having twice that of the females, because the Prophet (peace be upon him) instructed saying, “Fear Allah and treat your children fairly.” May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.