How is the Diyah (blood money) apportioned when competent and incompetent individuals jointly commit intentional homicide?

Primary text

The Diyah is obligatory upon them in thirds, with each individual owing one-third. Diyah is a replacement for the object killed, and since the object killed is one entity, its Diyah is singular, assessed according to its value. Qisas, however, is completed individually because it is a retribution for the act, and the acts are multiple. The one-third portion incumbent upon the competent adult is due immediately from his wealth because his act was intentional, and the *Aqilah* (surety group) does not bear intentional homicide. The portion due from the minor or the insane is borne by their respective *Aqilah* because their intentional act is treated as a mistake. This amount is due over one deferred year, as any liability amounting to one-third of the Diyah has a one-year term. Each individual must also pay the *Kaffarah* (expiation) from their own wealth, as their act is considered a mistake, and the participant in a mistaken killing owes Kaffarah as it is expiation for the act, not a substitute for the victim's value.