SOFT COVER SMALL SIZE - TWO BOOKS- BEST FRIEND SHOWDOWN & CUPCAKE CATASTROPHE - Meet Ella and Olivia. Big sister. Little sister. Best Friends. 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. The sisters love to dance, read and bake yummy treats!