Step-dad is full of something smelly and unpleasant.His step-dad has been telling him that if he leaves, then he will have to pay for past medical expenses incurred when he was a minor. Step-dad says he won't pay it any longer if the boy leaves.
The boy is not responsible for medical expenses incurred as a minor. Whomever signed the papers as the responsible party - Mom, Step-dad, or both - is who is on the hook for the bill. Period, end of story.
Step-dad's tantrum to the contrary holds no water.
Step-dad is sorely mistaken.He's also told him that just because he's 18 doesn't mean he's an adult and can leave their home. That if he's still in school then he's still a minor.
In the state of Utah, you become a legal adult on your 18th birthday, or the day you graduate from high school - whichever comes SOONER.
Kiddo can walk out the door at 12:01AM on his 18th birthday and never look back, if that pleases him. Sounds like it will.

