These videos are super scripted and the kids definitely don't edit the videos. They look professionally filmed, possibly by an outside company and then if not, their parents. The parents probably saw everyones reactions to Sabre's big personality on the Ellen show, so made the channel Sabre Norris. They wanted the younger siblings involved too to reach more audience so changed it to Sabre Norris & The Norris Nuts. Then they realised that the kids were loved equally by the audience so made the final name change to The Norris Nuts. Seems to be quite a brand.
These kids are super sheltered from the world. Whatever home education they're getting isn't much because they never seem to be very intelligent. They spend most of their days skateboarding, surfboarding, and filming their videos. One day they're going to face the real world and, if they've not still got the youtube money, the kids are really going to struggle. Especially the poor baby named Disco.
To be fair to Sabre, they said a while ago that she has a medical condition that hinders her growth and development - I believe it was this video