Since your s has already made a commitment, he should stick to it. Besides, he'll be making a little bit of money and being responsible/accountable by doing it.
I would let son work it out w/his father. I hope your son will stick to the commitment he made.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
