Jimmy Carter has always been a man of discipline and habit. But the former president will break routine Sunday, putting off his practice of quietly watching church services online to instead celebrate his 99th birthday with his wife, Rosalynn, and their children, grandchildren and great-grandchildren in Plains.

The gathering will take place in the same one-story structure where the Carters lived before he was first elected to the Georgia Senate in 1962. It comes amid tributes from around the world. But for Carter’s family, it’s an opportunity to honor a personal legacy.

“The remarkable piece to me and I think to my family is that while my grandparents have accomplished so much, they have really remained the same sort of South Georgia couple that lives in a 600-person village where they were born,” said grandson Jason Carter, who chairs the board at The Carter Center, which his grandparents founded in 1982 after leaving the White House a year earlier.