 RajanTiwari is the son of Kanti Tiwari (mother) and Vishvajivan Tiwari (father).He has a large family of several members among which some of them are popular in Motihari and near places

The political career of Tiwari began in year 2000 when he defeated Bhupendra Nath Dubey of SAP in 2000.After that he contested the Lok Sabha election in 2004 but was not welcomed by the voters of Bettiah.