 Del at first refuses, as Dr Becker treated their mother and did not want him to realise that she was seeing different men.Later that evening, Reg is clearly outstaying his welcome at the flat, having spent all of Rodney and Grandad's money, drunk all their beer, and wrote a bet on one of Rodney's GCE certificates.Del returns home and reveals that he took Rodney's advice and visited Dr Becker again, who confirmed that his blood type was actually "A" and not "AB"as recorded on the results, and that someone — Reg — had altered them in an attempt to isolate Del and take his place in Nelson Mandela House.