That has not stopped the estranged siblings from speaking out about their sister, most fervently during the months leading up to her wedding. In a letter published in InTouch in May 2018, Thomas called the union "the biggest mistake in royal wedding history." As for Samantha, she is coming out with a tell-all titled In The Shadows of the Duchess this spring, which comes after several instances of her giving negative quotes about the Duchess to the press.