Speaking as a native Californian I can confidently state there are a few options:
1. Live in full time housekeeper and child care provider with a gardening service. Additional house cleaning staff comes on a scheduled time a few times a week.
2. Live in child care provider who also provides some light housekeeping work, but with a cleaning/gardening staff who are regularly scheduled to come in a few times a week.
3. All staff (child care, housekeeping, gardening) do not live on premises but come in on a daily or several days during the week.
4. All staff (child care, housekeeping, gardening) do not live on premises but come one-two times a week and the occasional extra day when required.
I don't know about California, but I think the most common option in the US for wealthy families is to have a housekeeper/ cook who comes in evey day, but doesn't live with the family. She will normally come in the morning , have an 8-hour working day and then leave in the late afternoon/evening.
I don't think it is common these days to have butlers or anything similar to that. Donald Trump for example had a long-term butler before he became president and some other millionaires/billionaires might have one too.
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