Charlie's emotions were interesting, and it drew Fred closer. Never mind that he wanted to be closer to his brother in general, but the emotions...The anger, disbelief, sadness - It was quite the mix.
"I'm not a creature. I'm the same brother that changed Percy's Head Boy pin, and turned Ron's teddy bear into a spider, with George's help, of course." Fred raised an eyebrow and slipped his hands into his pockets. Appearances, obviously.
"What'd you name your kiddo? Everytime I go over there, no one says his name," he tilted his head at his brother. Charlie had to believe him. Once he did, he could tell Charlie that something was wrong here. It was all he could really do at this point.