For most families, yes. The Harvard Joint Center for Housing Studies 2026 State of the Nation’s Housing report documents a steady rise in multigenerational households driven by both aging parents and adult children who cannot afford to form independent households. The benefits are concrete: shared resources, proximity for caregiving, family cohesion across generations, and significant cost savings compared to alternatives (assisted living for aging parents, separate apartments for adult children). The challenges are also concrete and largely solved by good design: privacy, sound isolation, separate entrances, and considered shared spaces. A well-designed casita answers most of the design challenges directly.