I wish it were this simple in our world today ... for me knowingly allowing a parent to 'break the law' while on MY property concerns me liability wise ... what they do at home, off my property and without my knowledge is none of my business for sure but HERE on my property I have a due diligence still as a business owner and as a professional regardless of them being 'their kid'.
It is kinda like the stupidity of our justice system that if I have a party in my home and choose to serve alcohol and someone is stupid enough to than get behind the wheel and drive despite all the education about NOT drinking and driving and it being illegal if they get in an accident I can than be held liable and sued even though it was not ME who was driving or even in the vehicle just because they consumed the booze on MY property ... therefore if someone TRIED to leave my house after having drank anything and DRIVE I would have no choice but to call the cops to 'prevent' any liability for myself and do my due diligence to prevent harm to anyone .... same here if I knowingly allow a parent to leave my business / property without their child properly restrained and that child is than injured I do not want to than be held 'liable' for not having prevented that from occurring ... might be a very slim chance of that ever happening to me but having a simple paragraph in my handbook that states what will happen if they TRY reduces the changes further and well than clients KNOW what will happen if they were to still try it.