The Sprosty Twins
From the Program Book of the 12th IAGSDC Convention, held in Chicago, IL in 1995:
Don & Doug, twin brothers from Davenport, Iowa, began calling in 1972 at the age of 12. They currently travel extensively calling dances throughout the Midwest, concentrating mainly in Iowa, Illinois, Wisconsin, and Minnesota. They are also callers and instructors for three clubs in their home area. In addition Doug cues and teaches round dances and line dances. They have been members of CallerLab since 1981, and are members and past officers of the Quint Cities Square and Round Dance Callers Association.
Don and Doug have called for 23 consecutive Iowa State Square Dance Conventions, 23 consecutive National Square Dance Conventions, and numerous other conventions and festivals