Answer: Violence
Explanation: Since the leader has power, has more likely an army, or people who can fight. If the father is grieving, heś more likely to go to war and try to kill the leader off. Usually, in history, most families will choose that past. If not the parents, the siblings will do the violence. There is more likely to be bloodshed, one way or another for vengeance. No matter the reason why he died. Especially if he was an only child and the parents couldn´t or had trouble having another baby for whatever reason.