Is it permissible to give an ongoing charity (sadaqah jariyah) from the deceased's estate on behalf of their soul, with the heirs' consent?

It is permissible for the adult, mature heirs to give a portion of the inheritance as an ongoing charity (sadaqah jariyah) on behalf of the deceased. This is considered a relinquishment of their share. However, charity from the share of an heir who is not an adult or is not mature is not valid. Rather, their share must be fully preserved for them until they reach adulthood, whereupon it is given to them, because it is a condition for the giver of charity to be sane, adult, mature, and to have legal authority to dispose of property.