Is it permissible for a sick man to give his movable property to his needy nephews, knowing that he vowed to help them and fears poverty for them after his death?

If a man's illness is life-threatening and connected to death, then his gift is like his will: it is not valid for an heir, nor for more than one-third of his property, unless the heirs approve. Nephews are not heirs, so his gift to them is not valid for more than one-third unless his adult, mature heirs permit it. However, if the gift is less than one-third, it is permissible. If the illness is not life-threatening, then the gift is valid, whether it exceeds one-third or not, provided it is immediate and not contingent upon death.