Interestingly the death cert for Wilbur states parents names as John and Lizzie, not William and Lizzie...maybe he went by his middle name??
1870 census of Salem, Perry Twp Columbiana Co shows: Benjamin Hiddleson age 48, Mary age 40, and children John age 19, WILLIE age 17 (b)1853 and May age 13.
Ten years earlier I found a 6 yr old Willie Hiddleson living in Smith Twp Mahoning Co (right next to Columbiana Co) and the Willie from the 1870 would have been abt 6 yrs old in this one...so it's a likely match.
1880 census shows Elizabeth as single, age 27 with George W 5 yrs old,Adelbert 3 and Wilbur 2.