No, I'm not related. I found the DCs on FamilySearch which has the TX Dth Idx thru 1976.
Once I had a little info on them I just went looking. On the 1910 census Cherokee Co, TX Mary shows she's had 5 children with 4 living. Since there are only 3 listed in the household apparently one has already left the nest. I can't seem to find them in 1900 that would give you that fourth child's name. But, I think I found him on the 1920 census. Hand writing is poor, indexer lists head of household as Kirby, and name does end with a "y" I think it's probably Tobey.