Hello again Queen
It could be that he's not feeling ready to move in with you yet. It could also be that he would be too proud to just pay the smaller bills but would want to fully pull his weight with the rent and all. The best thing to do is ask him why he doesnt want to do that, and what happens if his son doesn't get a better paying job in 6 months? 12 months? 18 months? Then what?