With kids, unbelievably, needing some form of car seat until the age of 8~12.. you are limited in who can help with pickup/dropoff/after school programs to someone who borrows your car or is doing so often enough to buy the correct sized car seats for each of your kids. The upper limit being 12 is pretty wild considering we then let them drive at 16.
Oddly of course in the US, if your kid is taking the school bus they are entirely unbelted and without a safety seat from the age of.. 5.
As an uncle to multiple kids under 10, I end up only spending time with them in their own home or when they are brought over.
Contrast that with my upbringing spending time with cousins/aunts/neighbors being driven around by whoever I was staying with for the afternoon.