1930 Dallas-Dallas-District 18-Image 19 has: Will Harris(25), Jessica(25), Will Ann(2), and Jess Cain(6/12). Also part of the household was Walter H. Van Wort(55) enumerated as an uncle. Felt certain this was the "right" family 'cause Jess' middle name was maiden surname of his granny, Glennie. Later, found birth certificate for Jess Cain Galbreath, 13 Oct 1929, on https://familysearch.org/
The certificate was not accompanied by affidavits, typically part of "delayed" filings, so I'm guessing it was/is original? Martha Sue Galbreath was born 13 Jun 1939 in Galveston.