(2) has been living in a de facto union with the judge, who was unmarried, whether the person is of the same or opposite sex, for not less than three years, or for not less than one year if(a) a child has been born or is to be born of their union ;
(b) they have jointly adopted a child during their de facto union ; or if
(c) one of them has adopted the child of the other during that de facto union.