Supernanny Jo Frost faces a tough assignment when she agrees to move into the home of single mum Kelly Steer. Kelly's two young children have pretty much destroyed the family home. Out of control four-year-old Callum and five-year-old Sophia dominate the house. They fight with each other, won't eat properly, destroy their bedrooms, refuse to sleep at bedtime, and worst of all, they have been known to physically attack their mum.

The Woods family from Grantham call upon Jo for her expert advice and no-nonsense approach to child rearing. Their youngest child, two-year-old Charlie, is a raging toddler who is destroying and dominating family life with his out-of-control behaviour. Desperate times call for desperate measures; mum Lucy and dad Steve are determined to turn their lives around and adhere to the strict guidelines Jo has laid out for them, Charlie and their older children Billy and Caitlin. But even Jo, with 16 years of no-nonsense nannying and childcare practice behind her, admits it is going to be a challenge. 'I have never seen a boy run riot and control his family like he does... I am shocked to see how you have allowed him to become this bad.

Life has been tough for the Charles family since the birth of their twins 15 months ago. Their once well-behaved four year old Jacob now lashes out at his younger siblings.