You didn't mention any dates/approximate dates of b, m, d.
You might want to try the free search tool at https://familysearch.org/
Here are some possibilities in FL?
U S Census, 1930 Altha, Calhoun, Florida
https://familysearch.org/pal:/MM9.1.1/SP14-Z2M
head John T Welch M 65 Florida
wife Lizzie L Welch F 65 Florida
grandson Robert H Welch M 8 Florida
granddau Luvenia Welch F 5 Florida
granddau Mattie L Welch F 4 Florida
grandson John T Welch M 1 Florida
son Willis J Welch M 38 Florida Widowed b abt 1892
grandson George A D Yon M 14 Florida
U S Census, 1935 Altha, Calhoun, Florida
https://familysearch.org/pal:/MM9.1.1/MNJJ-2LM
Head Welch, Willis J age 40
Son Robert age 13
Dau Lavenia age 11
Dau Mattie age 9
Son Thomas age 4 (? John T)