Is a mother's will to her son for the price she inherited from his father considered a valid will?

A mother's bequest of her inheritance to her daughter is a bequest to an heir, and it is invalid unless ratified by the mother's adult, sane, and mature heirs. In that case, it becomes valid according to the majority of scholars. If some of the heirs ratify it, then it is valid only for the share of those who ratified it, provided their ratification is valid, excluding others.