Ben Harper dentist husband and father to three different and often difficult children learns he may become a father again. Panic-stricken he tells his wife he doesn't want to have another child as he doesn't like the ones he already has! Eldest son Nick is nice but dim and informs Ben that he has learnt alot from him but he is a terrible father; daughter Janey is worried that the cost of a new baby will come from her allowance whilst Michael the prodigious son is busy tracking h