You show family in Van Zandt Co, TX 1860-1910, does that mean you've already found them on those census records?From age and birth location of children in the same household with Josephias, on the 1880 census, they should have been in GA on 1870 census.
NameRelation Marital Status Gender Race Age Birthplace Occupation Father's Birthplace Mother's Birthplace Alcy M. COMPTONWifeMFemaleW54GAKeeping HouseSCSC Josephias COMPTONSonDMaleW24GALaborerGAGA James M. COMPTONSonSMaleW14KYLaborerGAGA Jacon COMPTONSonSMaleW12GALaborerGAGA Jocy E. COMPTONDauSFemaleW9GAGAGA Jessee A. COMPTONSonSMaleW6TXGAGA
Have you looked for probate and land records for Josephus?On the 1900 census it shows he is renting a farm, so there may not be land records, but there might be guardianship records for those minor children.There might be some kind of county record that would give his date of death.People often think if someone didn't own land, there wouldn't be any tax records, but if he owned a horse or mule, he would show up paying a poll tax.When he disappears from tax roll that would give you year of his death.If his wife lived longer then he did, she might show up the next year - only if she is a widow.If you can narrow down date of death, you then could look for an obituary.
Have you checked the Van Zandt Co, TX GenWeb site?I just took a quick look see.They have marriages 1848-1924 and J.G. and N.E. were married 22 May 1881.They have a long list of volunteers who will do specific lookups.There are some for cemeteries, you might find death dates from those records.If you haven't been using GenWeb sites, you've been missing out.They are manned by volunteers, so they do vary in content.