Speaking on his grandparents’ health, Josh Carter told People Magazine in an interview published in August that “it’s clear we’re in the final chapter.”

Rosalynn Carter, he said at the time, was cognizant of her diagnosis and had signed off on the press release in which it was announced.

“She still knows who we are, for the most part – that we are family,” he told the magazine, adding: “My grandmother is still able to form new memories.”

The Carters are the longest-married presidential couple, having marked their 77th wedding anniversary in July. They recently made a surprise visit to the Plains Peanut Festival in Plains, Georgia, ahead of the former president’s 99th birthday.

Jimmy Carter was born in Plains, and grew up in the nearby community of Archery. A peanut farmer and Navy lieutenant before going into politics, the Democrat served one term as governor of Georgia and one term as president.