Mollie and James are together and raising a family, which now consists of an older Mikey and his baby sister, Julie. Tension between the siblings arises, and as well with Mollie and James when Mollie's brother Stuart moves in. Mikey is also learning how to use the toilet for the first time. This time, a new baby is on the way, and it's a girl. Wrapped together with the standard conflict between mother and father, Mikey engages in a bit of sibling rivalry with his new sister.