I've got a 2-year-old and my successful founder friend has two under 4, we both WFH full time. Although I think he has a co-working space within biking distance in case he really needs to get out.
I dont have kids, I can see kids being at home during working hours may through a wrench into my rant. Especially at a young age when they dont understand what I'm doing.
Teach your kids boundaries young!