What is the ruling on neglecting the request of the deceased's mother for her share of something her son bought through an Islamic bank, which he verbally bequeathed to his daughters, and the heirs have waived their shares, knowing that his daughters have no one to support them but Allah, and they support their younger brothers, while his mother has many children?

A father's will stipulating that his inheritance should go to his daughters is a bequest to an heir, which is not binding unless the other heirs consent. If the deceased's mother does not consent and demands her right, she is entitled to do so. The heirs must enable her to receive her rightful share (one-sixth), regardless of her wealth or the daughters' poverty. However, if the mother initially waives her right in favor of her granddaughters and the daughters take possession of it, scholars differ on whether she can retract her gift. The Shafi'i, Hanafi, and Maliki schools permit progenitors to retract their gifts, with some differing details, whereas the Hanbali school does not permit it.