In Charlie's defense, I'll admit there are plenty of times that Grace (6) and Mary (nearly 5) have me doing a double take to see who's who. Their matching long sandy blonde hair, and similar size can cause me confusion to say the least. Charlie had us all in stitches tonight though, as he tapped Mary on the shoulder and bluntly asked, "Who are you? Are you Grace or are you Mary?"
It was so innocent and cute. If you don't know...just ask.