My 15 yo half-sister wants to take a 3-week summer internship she won with a famous photographer who is a senior critic at Yale. Her mother and stepfather don't want to let her, because, they say, she has to work and earn money baby-sitting all summer, not just 3/4 of it. Her room and board during the internship are provided for. My sister is desperate to participate in the internship and has been very organized about arranging it.
Is there any way my sister can go to the internship, or does she have to do what her mom says, no matter what?

