I found the 1870 Census where the family was living in Amboy, Lee Co., Illinois.
Chancey Judd, b. IL, 24, farm laborer.
Lucy, wife, b. IL, 23.
Benjamin, b. IL, 6.
Charles, b. Il, 4.
Emma, b. IL, 1.
Then I found a Lucy J. Judd who married William A. Gill March 14, 1878, Sangamon Co., IL. Source: Illinois Marriage Index 1851-1900, Record can be found at the County Court records in Springfield, IL. Maybe Lucy and Chauncey divorced.
The 1900 Census in Houston, Cassia Co., ID says that Chauncy was born May 1844 so I think that verifies the C. C. Judd in Mount McCaleb Cemetery.
To ensure it's your Chauncy, you need a copy of his obituary. Contact the Custer County Library and see if they provide an obituary service.
I also found info about Charles his son from his first marriage.
In 1900 Charles and his family were living in Custer Co., Houston District 38.
Charles Judd, b. IL Nov 1866, 34, marr 10 yrs, farmer.
Maggie, wife, b. IA Nov 1869, 30.
Earl, b. UT, Oct 1893, 6.
George M., b. ID, May 1896, 4.
In 1910 the family was living in Houston, Custer Co.
Charles E. Judd, b. IL, 43, marr 21 yrs, farmer.
Maggie A., wife, b. IA, 40, had given birth to five children but only three alive in 1910.
C. Earl, b. UT, 16.
George U., b. ID, 14.
Elsie E., b. ID, 7.
In 1920 Charles and family were living in Darlington, Custer Co., ID.
Charles E. Judd, b. IL, 53, general farmer.
Margaret A., wife, b. IA, 50.
George U., b. ID, 23, single, general farmer.
Elsie Mae, b. ID, 17.
In 1930 Charles and Margaret were living in Antelope, Butte Co., ID.
Charles E. Judd, b. IL, 63, both parents born IL, marr @ 23, farm laborer.
Margaret A., b. IA, 60, marr @ 20.
A Charles Ernest Judd born November 11, 1865 died May 10, 1936 in Soda Springs, Caribou Co per death cert #098359. Source: State of Idaho Death Index, abish.byui.edu/specialCollections/.
Check raogk.org/ to see if they have a volunteer in Caribou Co. If not, contact the Caribou County Public Library.
A Margaret Judd b. November 8, 1869 died May 24, 1942 in Pocatello, Bannock Co per death record #129094. Source: State of Idaho Death Index, abish.byui.edu/specialCollections/ . Successful Searching!