OHHH, OWEN. I think Prometheus has probably gotten decently used to putting up with/loving his bro despite all his flaws what with, you know, being his brother for the past couple of millennia or whatever. At least he means well, even if things don't always turn out right. He probably still tries to talk him down if he's ever accompanying Tom to some big fancy film event, though.
And on a personal note ngl he already sounds amazing :D