Which form of government serves the interests of royal family members

Explanation:

A monarchy is a sort of rule in which a group, usually a family serving a regime, personifies the country's political status and its ruler, the monarch, practices the role of supremacy. The original control of the monarch may change from merely illustrative, to incomplete and limited, to totally autocratic.

an informal structure in a bureaucracy would be something like so-called "office politics". where there's a formal structure set up for the organization, but then an informal subculture as well that has a way of organizing the bureaucracy further. this can be positive because it sets up an added degree of organization, albeit informal, within the bureaucracy.