Charlie huffed out a laugh and imagined what he must look like to Ginny, so much older now than he should have been and shook his head. "Yeah it's me." He didn't really know how to address the rest of it - this is probably why they had Aurors around and their procedures and things, but he wasn't about to hand his sister over to a bunch of kids.
She was so young, it was strange, it made him feel old, especially being so used to seeing her just a handful of years younger than him. This was going to be hell on all of them.
"Um... well it's a bit hard to explain actually." He started, because they couldn't just stand out here and keep circling around this issue. "It's a temporary reserve actually, at Hogwarts. Look this is going to sound insane, believe me I know it is - but ..." He shrugged. "Do you want to come inside with me." He jerked his head back toward the tents. "You've got to be cold."