Do the children of a deceased son inherit after the death of their grandfather, and if they do not, what should the grandfather do to ensure they receive a share of his estate?

The grandchildren, sons of the son, do not inherit from their grandfather in the presence of uncles. However, the grandfather may bequeath to them up to one-third of his estate. As for the feddan registered in the name of the eldest son, if it was a bequest after death to an heir, it is not effective unless the other heirs approve. If it was a gift during his lifetime, then justice must be observed among all children regarding it. It is permissible to distribute property during one's lifetime with justice, provided that anything from which the grantor retains usufruct until his death is considered a bequest. It is not permissible to bequeath the wife's share of inheritance to the grandchildren, because her share is her right.