I see 1920, 1930 and 1940 census records of a Henry J Ritter of Switzerland and Bertha Ritter of Kansas living in New York with children Mildred, Marie and Robert.
From: "United States Census, 1920," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MJ25-NLF : accessed 08 Feb 2013), Henry J Ritter, , Erie, New York; citing enumeration district (ED) , sheet 4B, family 92, NARA microfilm publication T625, FHL microfilm 1821104.
"United States Census, 1930," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/X7C2-Z7Q : accessed 08 Feb 2013), Henry J Ritter, Buffalo (Districts 1-250), Erie, New York; citing enumeration district (ED) 0169, sheet 7A, family 158, NARA microfilm publication T626, roll 1427.
"United States Census, 1940," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/KQ57-VKZ : accessed 08 Feb 2013), Henry J Ritter, Ward 13, Buffalo, Buffalo City, Erie, New York, United States; citing enumeration district (ED) 64-286, sheet 2A, family 42, NARA digital publication T627, roll 2832.