I am not related to your Felkers but I tried to find some info on your William. Unfortunately, I was unable to find his burial place or death date. I found an obit for Minnie and their son Wesley who died two days apart and Wesley, Doris and Minnie are buried in Dogwood Cem in Blytheville, Ar. I can't understand why William wouldn't be in the same cemetery as they lived in that area during the 1930-1940 period. If you want the obits, let me know. I will keep my eyes open for William. Good luck in your search.