I just noticed your message so apologies for the delay.William is indeed the son of Truman Burdick Maxson and Amanda M.(Engle) Maxson.Amanda and Truman had 5 children William H.,Robert E., Anna, Edward E., and John.Truman had another child (Duane)by his first marriage to Angeline (Angelina?) Clarke who died (?when?).Truman and Amanda were married either 27th or 29th Dec. 1855 in Fulton Cty IL. They were divorced Dec. 1870. Some of the children dropped the "s" from their names -- at least my ggrandfather,Edward, did.
I'd be glad to try to answer any other questions you may have. Best regards, Laura