Surely you understand this is completely out the reach of almost everyone in society?
What I'm sure most Googlers--and indeed many middle class people to greater or lesser degrees--use is a lot of shared services such as tradespeople, lawn care if they have a house, meal delivery, grocery delivery, car services, housekeepers, etc. You mostly don't need people full-time but many do consume people doing stuff for them that they could do themselves on a regular basis.
How often are these people brought on holiday?
Wow this blows my mind TIL
It's not very common much less routine but if I heard a presumably well-paid tech person tell me they had an au pair or nanny, it wouldn't cause me to think "They must have family money" or anything like that.
I don’t think you are..
Sounds absolutely reasonable! Do they differentiate in any way between the grandparents and the au pairs, or do they, for instance, also share accommodations?
Also how do you separate the grandparents from the au pairs in the family photos???