Ron had on a dress of Hermione's spelled just a bit so that it actually fit him, unlike some of the younger members of his family he couldn't just pull on a dress without a little help from a spell or two and hope to survive. Though really it looked like their survival was up in the air at the moment whether or not he'd managed to cover all the important bits in the dress he wore.
He joined his son while they waited for things to settle down a bit, arching an eyebrow at the dress Hugo had managed to find for himself. "Never tell me who that dress belongs to." Ron muttered, all ready scowling at the idea of any of his nieces owning such a thing, his mind refusing to believe that could be something Rose had in her closet.
Rather than think about which of his nieces owned that dress Ron waited, there was going to be cake at some point, he knew that, and of course he was waiting to break up any scuffles that might arise - Charlie looked like he was half ready to make good on his promise to kill them all. He'd do what he could to save his brother from jail time. Honestly it'd just be better all around if Charlie would accept that they were having this party and go with it.