Isma'ili sources say that, after the age of seven, as his father's designated successor, Isma'il was kept apart from his siblings, limited in his contact with the public, with his father taking personal responsibility for his education. Given his father's reputation as a scholar and the number of distinguished students who sought out his tuition, Isma'il would have received excellent training. It is said that whenever Ja'far was ill and unable to fulfill his duties as Imam, he deputized Isma'il, although his role was restricted to the confines of the home.