KM,
It's good that his dad is not harline about your son's associations. You might be surprised but hubby might actually be open to TTATT, just small things at first though. Maybe beards or somehting that he will benefit from if it wasn't a rule.
As far as your son is concerned, l hope he gets to go to prom. Some JWs here in the UK went to theirs, one was even prom queen!!!!
Kate xx