Cheney wrong on marriage: sister Wyoming: Mary Cheney, the younger sister of Liz Cheney, a Wyoming Senate candidate, has criticised her sister's stance on same-sex marriage and urged her own Facebook friends to share the message. Posting on Facebook on Friday, Mary, who is gay and married her long-time partner last year, wrote: "For the record, I love my sister but she is dead wrong on the issue of marriage." Their father, former vice-president Dick Cheney, supports same-sex marriage. Mary wrote: "Freedom means freedom for everyone."