This is a result of county government. Custody is the control that you have over something that you don't own, but which you possess at the pleasure of the party having ownership. Parents do not have jurisdiction over their children. They have custody. The county has jurisdiction.
Jurisdiction is power and control, which proves ownership.
Therefore, the counties own the children. Anything that is owned is property. Therefore, the children are property, owned by the county. Property doesn't have rights. Therefore, children do not have rights.