Meghan Markle allegedly offended Kate Middleton over 'baby brain' comment

More details about Prince Harry and his wife's Meghan Markle relationship with other members of the royal family are coming to light.

In his upcoming book, Harry recalled a tense exchange between Meghan, sister-in-law Kate Middleton and brother Prince William around the time of the Sussexes' May 2018 wedding.

The Princess of Wales allegedly demanded Meghan apologize to her after she suggested Kate had "baby brain," according to the Spanish language version of Harry's upcoming memoir Spare, En la Sombra, obtained by NBC News. "Baby brain" refers to the "memory problems, poor concentration and absent-mindedness" that women report during pregnancy and early motherhood, per the Mayo Clinic.

Harry said the couples came together over tea at Kensington Palace in June 2018 to try to reconcile.

Harry alleged that Kate—who gave birth to son Louis one month before Harry's wedding—told Meghan, "You talked about my hormones. We are not close enough for you to talk about my hormones!"