We've occasionally referred to DD this way. She's a "rules" girl, and is very conscious of when others break them. At the airport, I told her to stay away from the (motionless) baggage claim belt. She immediately inquired about a young girl who was sitting on it.

Saturday, one of her cousins, A, came for a visit. A is DD's age. Cousin E is 2 years younger. A took a toy from E while they were in a different room from DD. DD went up to A and demanded, "what did you do to my cousin E?" Yikes! To make it funnier, DD had, no more than 30 minutes earlier, made E cry by pushing her out of the way of her view to the TV. Hmmm. (E is OK).

Later, while A and DD were playing together, I gave them some pretzels, and told them to ask if they wanted more. After a while, DD asked. I noticed that the 2 of them were whispering back and forth before she made the request. As I handed her the pretzels, DD told me that it was A who really wanted them. (Tattle tale) I told both girls, that I knew that, since Mommies know everything.