If minors get married in tennesse, are the parents of the minors still liable for them?

my girlfriends son has his girlfriend knocked up, sorry for the harsh wording but its a very touchy subject with a lot of frustration. Is she being my girlfriend, still responsible for his actions. He has already been in trouble with the law and so on she is worried that if he gets out of her house and gets into trouble, will she get in trouble for him being a minor or will he be considered a adult