On June 18, 1915, he married Sara Dougherty and they had three children: Gladys (Millard), Janette (Jett), and Joe. In 1927, he formed the Carter Family band together with his wife. They were joined by Sara's cousin, Maybelle, who was married to A.P.'s brother, Ezra Carter, and they together formed the first commercial rural country music group. Carter was known for traveling extensively throughout the country and collecting and blending songs, particularly from Appalachian musicians. He is credited with writing more than 300 songs.