Cullen and Simone really get along. Dirk and I are both baffled by this phenomenon. Not that we were enemies with our own siblings, but there seemed to be a much bickering as there was peace. I would honestly say that these two play well in the sandbox at least 80% of the time. It's nice for us, because on the weekends they really don't demand the companionship of friends - they are fine just hanging together. Here are some pics from their recent slip and slide experience.