Roberta McCain, John McCain's 106-year-old mother, is expected to attend the services for her son at the Capitol, the National Cathedral and the Naval Academy, according to McCain aides.
She is expected to attend the formal ceremony at the US Capitol honoring her son's life and service to the nation on Friday morning. The late senator will lie in state at the US Capitol.
Roberta McCain is also expected to attend McCain's memorial service at the National Cathedral in Washington Saturday, where former Presidents Barack Obama and George W. Bush will deliver eulogies, as well as a private memorial service for her son at the US Naval Academy in Annapolis, Maryland, on Sunday.
The McCain matriarch was a frequent presence on the campaign trail when her son sought the presidency in 2008.
During his speech accepting the Republican presidential nomination in 2008, Sen. McCain credited his mother for raising him while his father, John McCain Jr., a Navy Admiral, was away.
"My friends, when I was growing up, my father was often at sea, and the job of raising my brother, sister and me would fall to my mother alone," McCain said. "Roberta McCain gave us her love of life, her deep interest in the world, her strength, and her belief that we're all meant to use our opportunities to make ourselves useful to our country."
He added, "I wouldn't be here tonight but for the strength of her character."
McCain told CBS News in 2008 that he and his mother become very close in his early years.
Sen. McCain is also survived by his wife, Cindy, and seven children.