Mandela has been married three times, has fathered six children, has twenty grandchildren, and a growing number of great-grandchildren. His grandson is Chief Mandla Mandela.[39] First marriage Mandela's first marriage was to Evelyn Ntoko Mase who, like Mandela, was also from what later became the Transkei area of South Africa, although they actually met in Johannesburg. The couple had two sons, Madiba Thembekile (Thembi) (born 1946) and Makgatho Lewanika (born 1950), and two daughters, both named Makaziwe (known as Maki; born 1947 and 1953). Their first daughter died aged nine months, and they named their second daughter in her honour. The couple broke up in 1957 after 13 years, divorcing under the multiple strains of his constant absences, devotion to revolutionary agitation, and the fact she was a Jehovah's Witness, a religion which requires political neutrality. Thembi was killed in a car crash in 1969 at the age of 25, while Mandela was imprisoned on Robben Island. All their children were educated at the Waterford Kamhlaba. Evelyn Mase died in 2004. Second marriage Mandela's second wife, Winnie Madikizela-Mandela, also came from the Transkei area, although they, too, met in Johannesburg, where she was the city's first black social worker. They had two daughters, Zenani (Zeni), born 4 February 1958, and Zindziswa (Zindzi), born 1960. Later, Winnie would be deeply torn by family discord which mirrored the country's political strife; while her husband was serving a life sentence on the Robben Island prison, her father became the agriculture minister in the Transkei. The marriage ended in separation (April 1992) and divorce (March 1996), fuelled by political estrangement. Mandela still languished in prison when his daughter Zenani was married to Prince Thumbumuzi Dlamini in 1973, elder brother of King Mswati III of Swaziland. As a member by marriage of a reigning foreign dynasty, she was able to visit her father during his South African imprisonment while other family members were denied access. The Dlamini couple live and run a business in Boston. One of their sons, Prince Cedza Dlamini (born 1976), educated in the United States, has followed in his grandfather's footsteps as an international advocate for human rights and humanitarian aid. Thumbumuzi and Mswati's sister, Princess Mantfombi Dlamini, is the chief consort to King Goodwill Zwelithini of KwaZulu-Natal, who "reigns but does not rule" over South Africa's largest ethnic group under the auspices of South Africa's government. One of Queen Mantfombi's sons is expected to eventually succeed Goodwill as monarch of the Zulus, whose Inkatha Party leader, Mangosuthu Buthelezi, was one of the political rivals of Mandela, before and during his presidency. Third marriage Mandela remarried, once again, in 1998 on his 80th birthday, to Graça Machel née Simbine, widow of Samora Machel, the former Mozambican president and ANC ally who was killed in an air crash 12 years earlier. The wedding followed months of international negotiations to set the unprecedented bride-price to be remitted to Machel's clan. Said negotiations were conducted on Mandela's behalf by his traditional sovereign, King Buyelekhaya Zwelibanzi Dalindyebo, born 1964. The paramount chief's grandfather was the regent Jongintaba Dalindyebo. Chief Jongintaba had arranged a marriage for Mandela, from which he fled to Johannesburg in 1940.[6] Mandela still maintains a home at Qunu in the realm of his royal nephew (second cousin thrice-removed in Western reckoning), whose university expenses he defrayed and whose privy councillor he remains.[40]