William married Ethel Lewis (b: 5 Jun 1915-d: 9 Oct 1978) and they had three children. William served in the Army during World War II, enlisting on 27 Mar 1944 and serving until 6 Dec 1945.

1. William L. Kessler Jr. (b: 15 Sep 1931 Baltimore-d: Jan 1978 Baltimore)
2. Alberta Gertrude Kessler (b:18 Jul 1935 Baltimore-d: 2 May 1996 Baltimore)
3. Charles E. Kessler (b: Abt. 1937-d: ?). 

US Census details: 

• 1920: District 0054 Buckeystown, Frederick County, Md. (11/24 Mar 3) William A. Kessler 60 (painting), Alberta G. 43, Edgar F. 23 (painting), Charles L. 19, Mabel L. 16, Anna L. 15, Paul 10, William 6
• 1930: 4527 Finley Avenue, District 0654, Baltimore City 501-673, Md. (26/55 Apr 9) Charles Kessler 28 (clerk, recruiting), Goldie 27, Irene 6, Doris 2 11/12, Charles L. 2 2/12, Gilbert 7/12, William 18 (brother)
• 1940: 814 Cedarcroft Road District 4-786, Baltimore City, Md. (14/40 Apr 5) William L. Kessler 26 (mechanic-furniture factory), Ethel 24, William L. Jr. 8, Alberta G. 4, Charles E. 3, William S. Lewis 48 (father-in-law), Mamie M. 42, William S. Jr. 19, Ida M. 18
• 1950: Could not locate census for anyone in the family.