Peter, There is a Thomas J. Massey b. 1863 who died Apr 10, 1920 Memphis, Shelby, TN of Surgical Shock.He birthplace is listed as NC,& he's married; f. James b. NC; m. Mary b. NC He has only been in Memphis 3 days (likely for the surgery) and is normally of Kerrville.
On Mollie's DC the informant is her son H. F. Massey who lists a residence at Kerrville.
The 1920 census, with James at home was taken in January, and by the time Mollie dies, she is a widow.
I think Thomas J. is your James, so possibly b. NC instead of TN.The info for Thomas J.Massey's DC is provided by the hospital.The question then is, who gave the hospital the info.If it was "James," then it might be correct.If one of the kids, maybe not, as sometimes when asked for the names of parents, kids give their own parents, not their grandparents.