I am looking for additional information about the parents and siblings of my great grandfather, Otto Karl Slater. Otto was born Oct 27, 1879 in Germany, immigrated to the US circa 1904, and passed away on Apr 20, 1970 in Akron, Ohio. He married Agnes Reid Tait in Ohio on April 3, 1929. He and Agnes had four children- Norma June (1930-), Anne Louise (1932-2000), Frances Mae (1934-), and Siegried Slater (1937-).
Does anyone have any information on Otto Karl Slater's parents or siblings? So far, I have not come up with any leads.