Water Play on a Rainy Day

One of the lovely things about summer rain is that it doesn't necessarily mean that you need to stay inside.  The other morning after a few days of on and off rain, the kids decided that they were going to go and play in the rain.  Then to my surprise (cause its not like it wasn't wet enough) they started filling buckets with water and playing a funny little role playing game.  I'd love to share what the game was about but after 15 minutes of watching I still couldn't figure it out.  I guess some games are just for brothers to understand.