Justin is not happy about giving up his room when Grandad comes to live with the family. He starts a war of attrition - the cat in the bed, salt in the sugar bowl, continuous occupation of the loo, in fact anything to drive Grandad away. Justin doesn't want his Grandad getting in the way of the Family Football Match. But when Dad is accidentally injured before the big game (a result of one of Grandad's strikes against Justin), it is Grandad who steps onto the pitch, plays a blinder and helps their team win the Match. The war of attrition is over and Justin and his Grandad become firm allies - even when Grandad decides to move out and live in own flat after all.