A.K.
I would definitely plan some little activities. I would go to Familyfun.com and print off some cute little art projects. I also agree that play-doh is fabulous. Or even a princess tea party - let them get in dress up clothes and have a tea party. Also, I would plan a snack. Something healthy and lite since it will be a let afternoon play date. As far as your son is concerned, I would let him play with you and the mom so that the girls can have fun without interuption. Have fun!