Minor Son is Terminated From Job....Can Parent Attend Firing Meeting?

[baffled]

My son is being terminated and the reason stated is stealing.
He was served popcorn without using any inventoried containers by another workier in his off time (common practice by asst managers). First they suspended him for a week, then kept telling him to call them next week to see if he's on the schedule. 3 weeks past as I think they were waiting for him to quit. Now they say we're firing you.

He had just been promoted to lead position at this theater 2 weeks prior.

He is a minor working on a work permit in CA.

He has a meeting to go pick up his last paycheck and officially be fired. Manager says that HR will NOT allow a parent to attend.

Is this legal and how do I find out more about Ca employment law with regards to minors & work permit?

[Stumped]

Well taking inventory, pop corn, without paying is a white collared crime. Not sure about some termination meeting. However sounds like there me be more details than be let in on. Good luck.