Is the distribution that the grandfather made of his properties, in which he singled out his two granddaughters, who are related to his deceased son, considered binding and enforceable, and what is the share of the two granddaughters from their grandfather's inheritance?

The two granddaughters do not inherit from their grandfather because they are excluded by the direct sons. It is commendable to make a will in their favor if they are poor. As for the division made by the grandfather during his lifetime, it is not binding unless it was a gift that fulfilled the conditions (possession and holding during the owner's sound health and full mental capacity). Otherwise, the inheritance is divided among the three sons and four daughters, with the male receiving the share of two females. The two granddaughters receive nothing, except through a valid will for one-third or less, or through a fully conditioned gift before the death.