The Bagthorpes: Ordinary Jack
Helen Cresswell Audio Book

Mad, bad and brilliant to know - it's the Bagthorpe family! Jack's the only one in his family who isn't a genius. Luckily Jack's got two allies: Zero his dog and Uncle Parker. Zero's not much help, but Uncle Parker's a star. Until he comes up with a plan to help Jack do something that none of his family could ever do: tell the future. If only they could foresee the trouble that lies ahead.