A 13-year-old boy wept as his father was jailed for six months yesterday for using a fake lottery ticket to claim a $3.4 million jackpot. Tsuen Wan magistrate Maggie Poon Man-kay said Cheung Yin-chuen, 66, deserved a custodial sentence because he tried to con the Hong Kong Jockey Club. Cheung, unemployed, presented the 'winning' ticket at an off-course betting centre in Castle Peak on September 9, 1995. The computer record on his Mark Six ticket did not match the winning numbers, although marks he had entered indicated he had won. Cheung had denied a charge of using a false instrument. Duty lawyer Sabrina See pleaded for mercy for Cheung, a single father with two teenage children to take care of. But Ms Poon said the defendant had to be penalised to deter others.