I guess I'm a noob but why can't you leave your job? I get it's family owned, but is there nothing else you could do like get a different job or go to school?
People do jobs that they hate every day. I do a job I hate every day. But I have a responsibility to myself and the ones I care about. I need the money. But I'm also going to school to do a job I actually want to do.
I would do the job, get through it, and focus on the things that do make you happy.