A FORMER ATV scriptwriter yesterday admitted masterminding a $93,500 robbery of his elderly relatives, who were tied up and blindfolded by two knife-wielding thugs. Au Tai-wai let in the armed robbers after paying a brief visit to relatives Yung Chit-kwong, 74, and Kwok Mui-heung, 63, at their home in Western, the High Court heard. As Au, 43, opened the door to leave, burly Shum Yuen-tau, 20, and a second robber burst into the flat and threatened the elderly couple with two knives. The retired merchant and his wife were then tied up, blindfolded and gagged with adhesive tape. Prosecutor Graeme Hagon said Shum, who weighs 104.5 kilograms and measures 1.88 metres, and his accomplice made off with cash, jewellery, watches and bank books after ransacking the flat. An hour later Au continued the charade when he reported the robbery to officers at Western Police Station. But further investigations revealed it was Au who had planned the raid and let the robbers in. Au, who was working for an investment company at the time, and transportation worker Shum admitted one count of robbing Mr Yung and Ms Kwok on August 20, last year. In police interviews Au said he had organised the raid to help a friend pay off loan sharks. Shum, who claimed he was paid $8,000 to take part, told police he entered the building after receiving a pager message from Au. Mr Hagon said Shum had later sold the jewellery at a goldsmith's. The second alleged robber, referred to as Ah Kit, was not in court. Deputy Judge Pang adjourned sentencing to a date to be fixed. Outside court police said Au, who has no previous convictions, was related to the elderly couple through his wife.