- [S175] Frances Gretchen (Klein) Leenerts, Descendants of Father Fiegenbaum (Chinook, Washington: F. Leenerts, 2002), page 107.
William R. Nelson and Gertrude Arnhold were married. No date or place of marriage given.
- [S104] Personal communication, 16 October 2003.
Email from W. Richard Nelson to J. Mark Fiegenbaum.
"...Katherine Gertrude Steinmetz, born in 1907. She married William Richard Nelson in 1928. They had three children, Nanette Arnhold Nelson (...), Thompson Charleton Nelson (...), and William Richard Nelson, jr. (...)."
From a follow-up email on 15 July 2008, "Charlton" is the correct spelling.