So I thought this video's attacks at that specific demographic were an unwarranted personal bias, but I also thought it made good points about the auto industry and good reasons why SUV's are bad.
For larger families, I guess each parent would get a cargo bike and split the load.
see https://www.dcrainmaker.com/2020/12/getting-the-christmas-tr...
You can fit 5 people in most normal cars, and 7 (especially children) in some estate cars / station wagons.
Failing that a minivan, although that's unusual.
Many people in Copenhagen and Amsterdam own a car, the difference is they don't use it for every journey. They're also much less likely to own two or more cars than in America.
A child seat on an ordinary bicycle is very common, typically for taking a small child to nursery. Cargo bikes work too, and are good if you have more than one child, although they're much less common than YouTubers would have you believe.
Once children can ride their own bicycle they will, and later they can ride alone. Similarly, they can use public transport, with their parents or alone.