President Jimmy Carter’s legacy of giving back endures in several nonprofits through which he and his wife, Rosalynn Carter, worked in the almost 50 years after they left the White House.

Jimmy and Rosalynn Carter were married for 77 years, making them the longest-married presidential couple in US history. Jimmy Carter died on Sunday.

The Carters, who long put their faith into action, were in Milwaukee in June 1989 as part of a Habitat for Humanity project building homes. They, along with scores of volunteers, hammered, sawed and painted to construct six homes near North 23rd and West Walnut streets.

The Carters met and raised their family in Plains, Ga. and returned to their beloved hometown after Jimmy's presidency

Perhaps Carter’s most revealing poem, “I Wanted to Share My Father’s World,” concerns the man who never got to see his namesake son’s achievements. He wrote that he despised Earl’s discipline, and swallowed hunger for “just a word of praise.”

Former President Carter’s marriage to first lady Rosalynn Carter played a defining role in his life, spanning 77 years and making it the longest presidential marriage in U.S. history. Jimmy

They had four children: Jack, Chip, Jeff, and Amy. The Carters have 25 grandchildren and great-grandchildren, The Carter Center said in a statement following Rosalynn's death. Their oldest son, 77-year-old John William "Jack" Carter, followed his father into politics.

Former President Jimmy Carter will rest in peace alongside his late wife of 77 years, Rosalynn Carter, with the two buried together at the modest Georgia home they shared for decades.

Jimmy Carter also considered his wife his muse. "She'd smile, and birds would feel that they no longer had to sing, or it may be I failed to hear their song," Jimmy Carter wrote in a poem titled "Rosalynn" from his 1995 book " Always a Reckoning and Other Poems ."

On Tuesday, Carter's body will be flown from Atlanta to Joint Base Andrews in Maryland, where his casket will be transferred with ceremony to a hearse. From there, a motorcade will proceed to the U.S. Navy Memorial, where his casket will then be transferred from a hearse to a horse-drawn caisson with ceremony.

President Jimmy Carter will continue to lie in state Wednesday after his remains arrived in Washington a day earlier as part of state funeral rites. The Georgia Democrat and 39th president died Dec. 29 at the age of 100.

The public will be able to pay their respects to the 39th president at the U.S. Capitol until his state funeral Thursday morning.