In response to Montana Gov. Brian Schweitzer's suggestion that Mitt would have troubles because his father was "born on a polygamy commune in Mexico", Romney told Fox News:
"My dad's dad was not a polygamist." He added, "My dad grew up in a family with a mom and a dad and a few brothers and one sister. They lived in Mexico and lived a very nice life there from what I understand and then when he was five or six years old there was a revolution in Mexico. They escaped."
Mitt's grandfather Gaskell did not officially marry his wife's sister until after her death. Given that the Mormon church had begun excommunicating polygamous members five years before he married Anne, that's not so surprising. However, Anne Amelia Pratt's younger sister Amy Wilcken Pratt did come along with them on their journey back to Utah.
As an expectant mother, Mrs. Romney was given a seat in a coach. With her were Miles, young George, who had just celebrated his fifth birthday, and Lawrence, his two-year-old brother; two of her sisters, Miss Amy Pratt, the schoolteacher, and Mrs. Verde Pratt Cardon, wife of Clarence Cardon, then a missionary in Paris, France. --- The Story of George Romney by Tom Mahoney
And then, after Anne died in 1926 he married her younger sister Amy.
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Odd, that Mitt's father George shares the middle name (Wilcken) of this sister wife. I find the whole situation to be rather creepy.