Tennis star Serena Williams guests as a teacher in an episode in which Jay volunteers to direct Kady's kindergarten-class play ("Romeo and Juliet"), and volunteers Michael to help her. But Jay, who has a very competitive side, doesn't want anyone to stand in the way of her "vision." And she treats her charges as though they were army recruits and she was a drill sergeant. Devon: Philip Daniel Bolden. Rachel: Liliana Mumy. Kady: Parker McKenna Posey.