Final answer:
The primary assertion of the claim 'Multigenerational households benefit families' is that multigenerational households have positive effects on families.
Step-by-step explanation:
The primary assertion of the claim "Multigenerational households benefit families" is that multigenerational households have positive effects on families. This claim suggests that having multiple generations living under one roof can bring various benefits to families, such as enhanced emotional support, shared caregiving responsibilities, passing down of knowledge and traditions, and increased financial stability.