A hereditary dictatorship, or family dictatorship, in political science terms a personalistic regime, is a form of dictatorship that occurs in a nominally or formally republican or socialist regime, but operates in practice like an absolute monarchy, in that political power passes within the dictator's family. Thus, although the key leader is often called president or prime minister rather than a king or emperor, power is transmitted between members of the same family due to the overwhelming authority of the leader. Sometimes the leader has been declared president for life and uses this power to nominate one of his family as successor.
A family dictatorship is different from a monarchy (where the descent is required by general constitutional law), or a political family (where members of the family possess informal, rather than formal and overwhelming political authority).
A family dictatorship is different from an absolute monarchy, and the ruler does not usually base his authority on the concept of divine right. In the latter, the transition of power within a family is required by general law as part of the state's constitutional arrangement, and continues to apply to all successions in the regime. In the former, this arrangement is not required by general law. In some cases, a special law might be enacted to formally nominate one particular family member of the present leader as the successor. In other cases, the law of the state may even formally provide for elections, but control exerted by the leader on the political and electoral process ensures a hereditary succession. Furthermore, whether each succession succeeds depends on the level of authority and control of the leader. As a result, modern family dictatorships often transition into a non-familial (non-personalistic) regime after a small number of successions: usually just one, and rarely more than two.
A family dictatorship is also different from other political families. In the latter, informal power and influence accrued to the family enables the family to continue to hold political power, often through open and contested elections. In the former, the family uses either formal legal or political power or control to ensure a familial succession, and usually via a controlled or uncontested election, or no election at all.