Piggybook is about a family of two boys and their parents. At first it seems like the perfect family, but then you discover that the mother is made to do all the work (e.g. washing, cooking, cleaning). She works all the time, and gets completely exhausted. Her husband and sons are complete pigs, only thinking of themselves, so one day, she leaves them. The boys can't manage by themselves, everything is messed up completely. They begin to wish their mother/wife was back. Soon, she does come back, with the condition that they all have to share the workload equally. So the mother never has to be the 'housemaid' again. The moral of this story would probably be 'absence makes the heart grow fonder'!