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Many of the very large houses here in California are family complexes intended for a compete extended family grandparents and great-grandparents down. This is especially the case for large houses which are built in middle class areas. Not so much the case for areas set up for "upper class" mansions.
A family of productive members can afford 3 or 4 bedrooms for each married couple with a large shared kitchen and gathering area much more easily than a house for each.