His parents began dating in 2005 and were engaged in 2009 over Thanksgiving weekend.
In June 2016, his grandfather, Bill Clinton posted a photo and the tweet reading "Aidan has made two dads very happy this Father's Day. Hillary and I are thrilled for Marc and Chelsea!"
His father, Marc Mezvinsky, is an investment banker. He has one older sister, Charlotte, and a younger brother, Jasper.
His grandfather was proceeded in the U.S. presidency by George W. Bush.