Kennedy was born in Washington, D.C., a year before his father's assassination. He married Molly Elizabeth Stark, daughter of Sharon Ellen Wing and John Sherwood Stark, on August 22, 1998 in Nantucket, Massachusetts. They have five children: Riley Elizabeth Kennedy, (born August 1999 in Nantucket, Massachusetts); Mary McCauley Kennedy, (born August 2001); Rowen Francis Kennedy, (born February 2004); George Skakel Kennedy, (born April 2007); and Daniel Boru Kennedy, (born January 2012).