Marcus just learned how to crawl on all fours this past weekend. Yesterday, he pulled himself up on Owen's bed, surprising Erin and Owen. Today, he was at it again in the bathroom. I sprinted over with the camera in time to catch him in the act. The camera shake and me talking to Owen is when Owen tried to crawl over my back to get in on the shot. Owen and Marcus spend their days doing what the other is up to. Owen plays with the dump truck, Marcus wants the dump truck. Marcus screams, Owen screams...