Theorists using a "functionalist" perspective emphasize that families are important for society because they are the primary source for the procreation and socialization of children.
Step-by-step explanation:
The functionalist viewpoint sees society as a complicated system, the parts of which work together to foster unity and stability. This viewpoint looks at society through some kind of macro-level prism, and usually emphasizes on the social structures that make up society as a whole.
The government, for instance, offers education for the family's children, which in effect pays taxes on which the state relies to continually run itself. From this viewpoint, system disorganization, like immoral behavior, leads to transition because it demands that social structures adapt to maintain equilibrium.