After Ida died, he married second Minnie D. Mason (1870-1947).
Sources
Find a Grave, database and images (https://www.findagrave.com/memorial/132802809/charles-r-mcmillan : accessed 02 March 2022), memorial page for Charles R. McMillan (16 Jan 1866–18 Aug 1934), Find a Grave Memorial ID 132802809, citing Addison Cemetery, Addison, Somerset County, Pennsylvania, USA ; Maintained by Ancestor Searcher (contributor 47848612) .
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