Grown-up teenager Jemima has a new boyfriend and he's coming to meet the family for the first time. Jemima is at the stage when she finds her parents embarrassing and makes the whole family promise to behave. When Barnaby arrives, however, he discovers Jules practising the Sunnysands summer stomp in the meadow. Jemima is cross.

And it doesn't get any better when Great Aunt Loretta arrives and shows Barnaby a hideous old Heidi doll that Jemima used to love to play with when she was little. Jemima goes off in a huff and Grandpa fails to calm her down. So he shrinks instead and dresses up as the Heidi doll. His antics amuse Barnaby and in the end even Jemima has to laugh. And we discover that Barnaby thinks the whole Mason family are really cool. He even wants to dance the Sunnysands summer stomp! Show less