Hilary: (on growing up with her sister) If Haylie had friends over to stay when we were little, and they left me out, I'd freeze their underwear! I'd wet the knickers, put them in the freezer and snap them to ruin them. Whatever I did, Haylie always got me back. Older siblings know how to be good fighters - when you're younger you just hit back. I'm sure there were a couple of flying hairbrushes.