If the parents are unable to coerce the children without help from the legal system, they're expected to call social services to take over. This is not a hypot

If the parents are unable to coerce the children without help from the legal system, they're expected to call social services to take over. This is not a hypothetical case, older minors can overwhelm physically their parents (or grandparents, usual when parents are drug addicts) and sometimes the children are very difficult to deal, maybe they have a personality disorder.