The kids were homeschooled from the very beginning.they have said many time that they have never been at school.I believe when they first started YouTube they were in school because I remember watching something about biggy getting bullied at school. They all had school friends at some point and then their parents decided to homeschool them when they got bigger on YouTube.
This was back when they would have been in primary school so only basic learning for most of them.
It’ll be interesting to see whether they actually do enrol the two younger ones in school or just ruin their education too