Tuesday, Dec. 17—Doug and Courtney Kauffman of Lancaster, a son, Duke Douglas Kauffman, 9 pounds 2 ounces, 21.5 inches long, born at 6:27 p.m. at Mercy Medical Center in Dubuque, Iowa. He joins two big brothers, Dayne  5 and Dax 3. Grandparents are Bill and Betty Yager of Lancaster and Bob and Pam Kauffman of Bagley.