The closest thing to an exception has been that Kallixta worked hard on the Molten Front, earning the Hippogryph, while Syylia didn't. She is still spending time catching up on a bunch of Cataclysm stuff.
With summer, my son has been spending much time using the account, playing with his sister. They're having a good time, but it does mean that many of Ellyiia's achievements show up on Aldonza or Kallixta's Activity log.
Luckily Equipment rewards don't show up. That would be even more confusing.
About my only activity in the past couple weeks has been Aldonza doing Tiller and Angler dailies. Just so you know what I was really doing Last Night: