Unless he also changed his name, I'm only finding one Granville that seems to fit your man. On his death certificate it says he is divorced. TX Dth Idx 1890-1976 -- http://search.labs.familysearch.org/recordsearch/start.html?..#w=;p=2;c=1320964;t=searchablehttp://search.labs.familysearch.org/recordsearch/start.html?..#w=;p=2;c=1320964;t=searchable -- You can view digitized copy of original death record for more details. Informant was E.J., which fits son of your Granville. You can also view Nellie's death record, too. She died in 1962 and buried in the same cemetery as Granville. Her informant was Mrs. Harold R. Coffman, is that the married name of her daughter????
1880 census Lawrence Co, MO:
Category: Name;Relationship to head of household; Marital Status; Gender; Race; Age; Birthplace; Occupation; Father's Birthplace; Mother's Birthplace.
George KERBEYSelfMMaleW47MOFarmerKYMN Liza A KERBEYWifeMFemaleW47MOKeeping HouseKYKY Wade KERBEYSonMMaleW29MOFarmerMOMO David KERBEYSonSMaleW26MOAt HomeMOMO Granvil V. KERBEYSonSMaleW23MOAt HomeMOMO Surlin KERBEYSonSMaleW21MOAt HomeMOMO Robbert N. KERBEYSonSMaleW15IAAt HomeMOMO Walker KERBEYSonSMaleW10MOAt HomeMOMO William KERBEYSonSMaleW8MOAt HomeMOMO May KERBEYDauSFemaleW6MOAt HomeMOMO Bell KERBEYDauSFemaleW3MOAt HomeMOMO
1870 census Cedar Co, MO:
Kirby, George, 40, b MO " Eliza, 37, b MO " Wade, 19, b MO " David, 17, b MO " Granville, 15, b MO " Sterling P., 13, b MO " Robert, 5, b IA " Walker, 1, b MO
Next door is Wade Kirby 59, brother to George and on the same page is David R. Kirby 74, b KY, their father, and next door to him is William 31, another son of David's.
Go to Rootsweb's WorldConnect -- http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgihttp://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi -- type in Kirby, David, born Kentucky, 1796 + or - five years. You'll find several people working on this line and some show different information. You might contact a few see about their sources etc.