I sense that both you and he must be pretty young yet, since you "want to be a traveling nurse" but I could be wrong.
He could train to be:
a short order cook, barber, gardner, writer, dog-walker, cashier, personal shopper /stylist, dog-trimmer, animal care assistent, substitute teacher, handyman with a speciality (like putting up ceiling fans or pool maintenance, if you spend time in a warm climate. Or snow removal in a colder climate), work as a mover or at a warehouse storage, or in the back room in a department store, stock work opening boxes.
Also, working at assisted living facilites (with older folks) is in ever-growing demand.
Would be nice to know his skills. Would be nice, too, if he would post his own personal question here.´Anyway, good luck to you both.