Quick answer: For 12 to 18 people across three generations, an 8-bedroom, 10-bathroom estate, sized using roughly 1 bedroom per 2 to 3 people, comfortably works.
Why it matters: Multigenerational trips have a wider range of needs than a same-age group — grandparents want quiet space, kids want active space, and the room count needs to support both.
The short answer: The same 8-bedroom, 10-bathroom sizing that works for a wedding party also comfortably supports a 12 to 18 person multigenerational family group.
What to check:
- Does your group span three generations with meaningfully different needs?
- Have you planned for spatial separation — quiet areas for grandparents, active areas for kids — not just enough bedrooms?
- Is the bathroom ratio adequate for the group’s overlapping morning routines?
The bottom line: Multigenerational trips succeed less on raw bedroom count and more on whether the property allows genuine separation between different generations’ rhythms.