I made a plan in my twenties to work for my uncle in a minimum wage position selling his art reprints. One day I'm expecting him to give me the rights to his work and then I'll be all good financially.
What will you do when your uncle passes away and leaves the rights to his art to you?
My plan was to keep his "reprints" alive in some way by hiring mediocre artists, then finally keeping the rights when uncle finally dies after he gets old.
While working for your uncle could be acceptable, it isn't acceptable to do so just for the possibility of receiving a large inheritance later. You should instead work and develop your own skills so that you don't rely upon the assets of others to live a comfortable life.
So I'll be broke for my entire life and struggle for no reason?
Just because you work for him doesn't mean he intends to leave you anything. You should only do the job because you enjoy it not because you are hoping to hit the jackpot when he dies.