Is it permissible for an unmarried woman who has no children to write a will bequeathing her money and inheritance to her maternal half-siblings, knowing that her full siblings are not in need of her money, and is it true that maternal half-siblings do not inherit?

Brothers and sisters from the mother's side inherit under two conditions: the absence of a male inheritor from the root (ascendant), and the absolute absence of any descendant inheritor.

In the case where they do not inherit, the questioner may bequeath something to them from her wealth, provided it does not exceed one-third. Anything exceeding one-third is contingent upon the heirs' consent.

In the case where brothers from the mother's side do inherit, a bequest to them is not effective unless the heirs consent to its execution.

To benefit the two brothers from the mother's side, the sister can transfer ownership of some of her wealth to them and enable them to take possession of it during her lifetime.