Carl Bartelt married to Bertha Hennemann

I am looking for info on Carl Bartelt/Bertha Hennnemann(sp) who were parents of my Grandfather Fred Charles Bartelt b.May 23/1896 d.June 22/1964, Fred married Mayme King,b.9/25/1900 d.4/2/1971They had two livning children, Geraldine, Milton,b.2/2/1921 d. 11/26/1985 who was my father, and one stillborn baby