 Reg tells his two sons and father that he has been living in Newcastle, and has recently been diagnosed with a hereditary blood disorder.Del and Rodney quickly take blood tests, which both turn out negative when they receive their results on New Year's Eve, but Grandad notices on their results that they have different blood types.Grandad explains that around the time that Rodney was born, Reg and their mother Joan were having frequent arguments, and Joan flirted with other men.