1. The short version
NestBoard is designed for households, not for kids signing up on their own. Children never create an account and never need an email address.
A parent or guardian creates the household and adds a "kid seat" for each child from inside their own account. The parent stays in control of what the child sees and can do.
Because a verified adult creates and controls each seat, the parent provides consent for the limited data tied to that child. There is no independent child registration anywhere in NestBoard.
