A typical Saturday for Rosie Yates, a nine-year-old girl with a severe learning disability due to an undiagnosed chromosomal disorder, living with her dad Simon, mum Emily and brother Ben.

It's bath night for Rosie and, as usual, that means chaos as she insists on having all the bubble bath. Emily decides that she needs to form a strategy and lays a trap for Rosie, putting the bubble bath out of reach.

A trip to Rosie's favourite place, the swimming pool, ends in disaster when she decides she hates it. Emily begins to wonder if it's just that Rosie wanted to do something else and becomes fixated on working out what Rosie wants.

Simon's mum and stepdad, Grandad John, a no-nonsense Yorkshireman, come to stay, and they're never shy with their opinions on Simon and Emily's less-than-perfect parenting skills.

Rosie is incredibly excited: Gandalf is finally coming because there's going to be a birthday with lots of presents. It doesn't matter to Rosie that it's Ben's birthday.

Feeling totally outshone by Rosie's amazing school teacher Abigail, Em concentrates on trying to develop Rosie's sign language.