The couple has three children, Theresa Nemmers of Sioux City, Kevin and Erika Nemmers of Le Mars and Cory Nemmers and his fiancée Heidi Huedepohl of Le Mars. They have three grandchildren, Kaden, Joshua and Maddie.
Mr. Nemmers and the former Angela Reskie were married May 4, 1968,. at Sacred Heart Catholic Church in Laurens.
Angela is a beautician at The Mantrap in Le Mars. Dennis is self-employed, operating Dennis T. Nemmers Construction in Le Mars.