Widjaja had several wives and at least 40 children. His first wife was Trinidewi (or Trini Dewi) Lasuki, who died in 2017. Eka reportedly treated the children of his first wife as his heirs while providing financial support to his other children to help start businesses. Most of Eka's children by Trinidewi—six males and two females—are involved in the family businesses. The eldest daughter, Sukmawati Widjaja (Oei Siu Hoa), serves as Sinar Mas vice chairperson since 1988. Sukmawati was previously married to her cousin, Rudy Maeloa, who was Eka's right hand who died in 1988. Eka's eldest son, Teguh Ganda Widjaja (Oei Tjie Goan), heads the pulp and paper division of the group as the chairman of Asia Pulp & Paper. Teguh's brothers are or were in charge of other divisions; Eka's third son, Indra Widjaja (Oei Pheng Lian or Oei Beng Nien), of financial services; the fourth son, Muktar Widjaja (Oei Siong Lian), of property; and the youngest sixth son, Franky Oesman Widjaja (Oei Jong Nian), of agribusiness (he is the chairman of Golden Agri-Resources). Indra Widjaja's son, Fuganto Widjaja, is heading coal mining and trading company Golden Energy and Resources, Sinar Mas' Singapore-based subsidiary, and is considered as the group's new face, proclaimed to shift its focus to energy and infrastructure, telecoms, healthcare, and education.