David Cameron's mother says 'he just won't be told' on gay marriage David Cameron has failed to persuade many of his MPs that the law needs to be changed in favour of same-sex marriage. But has he managed to convince his close family? Mandrake asks only because the Prime Minister's mother, Mary Cameron, attended a lunch the other day when she was asked why her son was pressing ahead with the legislation when it was alienating so many of the Conservative Party's natural supporters. "I know, but David just won't be told," she replied. Mrs Cameron, 78, whose father was Sir William Mount, 2nd Baronet, is a retired Justice of the Peace. Her son announced in 2011 that the Government intended to introduce same-sex civil marriage by the next general election, even though the policy was not in the Tories" 2010 manifesto or in the Coalition Agreement with the Liberal Democrats. "I don't support gay marriage despite being a Conservative," he declared in his conference speech. I support gay marriage because I'm a Conservative. Critics have, however, accused him of introducing the plans to please the Lib Dems and curry favour with the BBC and metropolitan, Guardian-reading liberals. Cardinal Cormac Murphy-O'Connor, the former leader of the Roman Catholic Church in England and Wales, suggested that Cameron's stance called into question whether he could personally be trusted. Last June, the Government completed a consultation on same-sex marriage, but this was described as a sham.