You probably already have it, but William Honce's bio is here:http://www.archive.org/stream/biographicalrevi00chic#page/23...
According to this, he died August 1, 1899.
If he left a will, perhaps Charles is mentioned in it.
The Illinois Regional Archives Depository (IRAD) system has the following probate records for Hancock County, Illinois:
Probate Administrator's and Executor's Reports
Probate Administrator's Record
Probate Administrator's Record With Will Annexed
Probate Case Files
Probate Case Files, Guardians
Probate Claim and Judgment Dockets
Probate Conservator's Record
Probate Executor's Record
Probate Guardian's Record
Probate Inventory Record, Guardians
Probate Inventory, Appraisement and Sale Record
Probate Record Index
Probate Sale Petitions Index, Real Estate
Probate Widow's Relinquishment and Selection Record
Probate Will Record
You can request information from these FOR FREE! See this page:http://www.cyberdriveillinois.com/departments/archives/irad/...
They also have Hancock County death certificates, court records, land records, etc. etc.