Who is Austin Swift?
Austin Swift (born March 11, 1992) is Taylor Swift's younger brother, who is two and a half years younger than she is. He attended the University of Notre Dame for the 2010-2011 school year, but transferred to Vanderbilt University. He transferred back to Notre Dame, and is now a junior.
He and his friends often appear in Taylor's music videos.
One site mentions this on Austin: "As Taylor's kid brother and the youngest child in their family, Austin moved with the family to Hendersonville, TN where he is a student and a freelance photographer for Getty Images. Some of his photographs of Taylor appear in publications like People magazine and Rolling Stone Magazine."