I also read that he was in the Castle Suite. I also read (same story) that no other family members went with them, it was just the two of them, so I don't think the lady in the picture is his sister. They had a picture of her stating that she usually helps him w/Suri but did not go on the trip.
I am another one who always thought to myself to stop carrying her. But like posters have pointed out w/the media taking pictures, I think I would probably carry my child too so they wouldn't get knocked down.