I believe I have your Wm. Edw. KETCHUM. (I show him born 1876?). His parents were Wm. Christopher KETCHUM (b.1848 Illinois) and Frances TIBBS. His grandparents were Christopher KETCHUM (b.1806 in TN? died 1851 Christian Co., Illinois) and Mary Ann TRAUBER b. 1822, d.1848. This Christopher KETCHUM b. 1806 was son of Edward KETCHUM who was my ancestor.
I show your Wm. Edw. KETCHUM had a brother (Warren) and two sisters (Frances Tibbs KETCHUM and Fannie Bell KETCHUM)
See my web page http://www.hal-pc.org/~berrys
for searchable database about this family.