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Mary Cheney, who married a woman last year, had some choice words for her sister, Liz Cheney, Sunday after Liz again voiced her opposition to same-sex marriage.
"Liz - this isn't just an issue on which we disagree - you're just wrong - and on the wrong side of history," Mary Cheney posted on Facebook.
Their father, former Vice President Dick Cheney, weighed in on the sisters' disagreement last month in an interview with Jake Tapper:
TAPPER: So one thing that she did that I thought was interesting was, um, she came out against same-sex marriage.
TAPPER: Obviously, your other daughter, Mary, married her long-time partner –
TAPPER: - last year. I assume that Liz, you, the whole family was there and supportive. I know you've - you were, for many years, to the left of President Obama when it came to some of these issues. Is that going to be an awkward Christmas table conversation?
CHENEY: Well, I, uh, my position on - on that issue is well known, I - and I've stated it in 2000 in a debate with Joe Lieberman. It hasn't changed. And I'll let my daughters speak for themselves.
Liz Cheney told CNN's Jake Tapper, "I love my sister and her family and have always tried to be compassionate towards them. I believe that is the Christian way to behave."