Meet Ella and Olivia.<br/>Big sister. Little sister. Best friends.<br/><br/>Ella and Olivia are sisters. Ella is seven years old. Olivia is five-and-a-half years old. They live with their mum and dad and little brother Max.<br/><br/>Ella and Olivia are making cupcakes for Dad's birthday. All the family will be there! But when a cooking disaster strikes, will the party be ruined?