To be honest that describes most of my local friends - children at a private pre prep and the two major groups are either 1) perma busy but very switched on to school stuff two career families - both parents work / take turns to be available 2) glossy Home Counties mummies with less present city husbands (who often try + make up for it by doing the lion share at the weekend)
Everyone has large, regularly cleaned houses, most people have access holiday houses - either their own as we get older, or use of parents etc - lots of nice holidays, very present parents + often other family around. In a year group of 50 there are only 2 single parents - which I’m sure will change a bit as the children get older - it’s also super normal to have grandparents round the corner / close by to help. Plus a gardening team, regular handy man to keep on top of things etc.
They like to travel with their families, but are also quite on the ball about ‘capital culture’ - they’ll watch classic movies with their children + talk about them. They’ll take them to museums + concerts + exhibitions. They do the reading, are pretty diligent about nutrition + everyone has their children tucked up in bed before 7 - even if they aren’t asleep.
I like to maintain an air of being much more on-the-edge than I actually am - so I don’t get roped onto some sort of appalling parent social committee (the pta are like vultures, they can smell untapped competence from 100m) - but I, and at least 75% of the families at school are like your description OP - I promise that all of them are frazzled by bed time and always a bit worried they’re screwing everything up all the time. Some of them have explosive arguments with their husbands and some of them are desperate worried about sick family / wild child behaviour etc
it’s interesting you describe it as middle class. I’m not sure that term is very useful here really. What we / these people are is probably more to do with more money than a lot of people imagine.
not having to worry about money / bills frees up a lot of time + energy. It takes quite a lot of income / capital to fund a life where you don’t need to think about it beyond musing about pension contributions + occasionally having to sit down with boring rob from the bank to talk about investment risk appetite (rob does not find this boring, he is very animated about it, he often has charts)
our life costs about 90k after tax / year to tick over - with no mortgage. That includes school fees which we pay half of (grandparents pay other half), house keeper 2 days a week, team of gardeners, caterers for occasional party, music lessons, riding lessons, 2-3 overseas holidays, weekends in family holiday houses in Cornwall + Brighton.
I suspect all the families I know, who fit your description, are earning at least 200k / year between them, have wider family support + a pretty privileged background behind them - that allows them to confident navigate the social space that comes with longstanding familial wealth.
All this to say, I actually think it is 90% money - and the remaining 10% is a consequence of having a history of feeling financially comfortable. That sounds sh*tty - but I think it’s less awful than believing some people have a mythical ability that others are missing.