A Shaanxi province official has been expelled from the Communist Party for having five children with his wife and a mistress, amid a continuing crackdown on violations of the one-child policy. Qin Huaiwen, director of Yulin city's Yuyang District Construction Bureau, was stripped of his membership late last year for adultery and having more than one child after his mistress reported him, Huashang Daily reported yesterday. The city party disciplinary committee and the city family planning authority found that Mr Qin, 49, had three daughters with his wife, and a daughter, seven, and son, five, with the 31-year-old mistress. Only two of the daughters with his wife were listed under his household registration, while the third was registered under his wife's sister's name. DNA tests proved paternity of the three unregistered children. A construction bureau official said that Mr Qin had 'made the mistake' because of the traditional preference for boys over girls. Although Mr Qin has maintained his position in the construction bureau, which he has headed since 2002, the disciplinary committee suggested removing him. Possible punishment also included kicking him out of the civil service. Since introducing the policy 28 years ago, authorities have kept a tight grip on family planning, especially among officials. Incidents of the rich buying their way around it have triggered discontent and prompted the National Population and Family Planning Commission to consider tougher punishments. Hunan governor Zhou Qiang had said that provincial cadres and local delegates to the National People's Congress and the Chinese People's Political Consultative Conference would lose their qualifications if they breached the policy.