I did not find your William Albert Knedler in my files, but it is fairly likely that he is connected to my line as they are in SE Iowa, too. I did find this on LDS: William KNEDLER Birth Date: 13 Dec 1910 Death Date: Jun 1968 Social Security Number:480-09-8242 State or Territory Where Number Was Issued:Iowa
I did have this in my notes for Thomas Irvin Knedler who is connected to my line: " Hi! My name is Thomas Irvin Knedler, I am trying to start some reasearch on my family name. My father's name is Irvin Dale Knedler, he was born in Fairfield, Iowa,I believe his fathers name was Estel Decora Knedler. Estel was married to Mary (Warner) Knedler in Iowa. Thats a start with a little info I know. I appreciate any help you may be able to provide. Thanks, Tom Knedler "
There is a Jon Kent Knedler who m. 18 April 1981 in Mount Pleasant, Iowa. His father was William Paul Knedler of Farmington, Van Buren Co., Iowa.
Also, Lydia Knedler [d/o George] who d. 24 June 1907 in Mt. Pleasant, Henry Co., Iowa. She may have been mentally impaired and the rest of the family apparently looked out after her. [There is a mental institution in Mt. Pleasant.] She did have a son William Jasper Carroll Knedler [b. 13 May 1852 in Ohio] but she was never married.
Have you checked census records? Mount Pleasant is in Henry Co and Fairfield in Van Buren Co., if that is helpful? FYI - I grew up in Van Buren Co. as a child and my grandpa was a Knedler of Davis and Van Buren counties.
Also, there are the spelling variations Knoedler, Kneedler, Knedler and Needler. You might check those GenForums, too, if you haven't already. I have posted some of my line on Knoedler GenForum.
Let me know what you find and if I can be of any further help [such as maybe checking the census for you when I go to the genealogy and historical libraries].