Is it permissible to carry out the grandmother's will to divide the inheritance between her daughter and her grandson only, to the exclusion of the remaining heirs, due to their financial circumstances?

The will includes two provisions: A bequest to the daughter, who is an heir. This bequest is not effective unless approved by the adult, sane heirs. And a bequest to the grandson, who is not an heir. This bequest is effective up to one-third of the estate only. Any amount exceeding one-third is not effective unless approved by the adult, sane heirs. We recommend consulting scholars directly regarding matters of inheritance and bequests.