Do the sisters have the right to demand a share of the gas station that the father allocated to his son to compensate him for what he considered an injustice, knowing that the father had divided his money before his death, registered all his properties in the son's name, and informed the two daughters that they owned nothing other than what he had given them?

The situation of this station is one of two possibilities: Either it remained in the father's possession, and he managed it until his death, without it being taken possession of from him, in which case it is considered an inheritance to be divided among all heirs, because it was a gift where an impediment occurred before possession. Or it was taken possession of from him before the impediment occurred, which is a matter of dispute. The preponderant opinion among the majority of scholars is that it is enforceable and established for the donee, and the remaining heirs have no right to revoke it. This is explicitly stated by Ahmad and is the view of Malik, Al-Shafi'i, and most of the people of knowledge.