Child Labor or Valuable Learning Experience?

I got a great deal on a Learning Tower on Craig's List the other day and we have been getting a lot of use out of it. Today the girls "did the dishes" which consisted of me filling the sink with soapy water and putting a couple of non-breakables in it along with a sponge. They had a lot of fun, and I got to cook a real meal while they "worked." In the video you can see Zoe making "the face" and saying "cheese", which she does when she thinks you are going to take her picture. Her cousin Chase made the same face when he was around this age. I wonder if it's genetic....