Hi, I'm MOH for my best friend and she's having the toughest time convincing a groomsman, also the groom's brother to wear a gray suit like every other groomsman. The other two already bought gray suits but he told his bro that he's wearing navy because "that's what he already bought." Bride and groom have offered to help him buy or rent gray but he's holding out for blue. Groom and groom's mother have told the bride that she's crazy and have called her a bridezilla for not accepting that one person in the entire wedding party won't match. He's family so it's tough to ask him not to stand but the bridesmaids are in deep purple which will clash really badly with the blue. Any tips on how to convince him and the family that he needs to suck it up and wear gray??