Robert Gunyon Church was recorded consistently as Robert G. Church for official records such as his birth document and the census. He appears with his wife Bessie in the 1905 Wisconsin Census and in the 1910 and 1920 Federal Census records for Wisconsin.
They lived Milwaukee's 6th Ward on the west side of the Milwaukee River. In 1920, there were three children: Jean, John and Marian. According to census records, in 1905 Robert was a grocer, in 1910 he was a roofing and building contractor and in 1920 he was a commercial traveler for roofing materials.
In the 1930 Census, there is a Robert G. Church living in Fort Worth, Tarrant County, Texas. Several factors make me think this is the same person. He worked as a salesman in lumber, he was 47 years old and he was born in Wisconsin to a father born in Wisconsin and a mother born in England. That parallels his record in the 1920 Census.
You are searching for Robert G. Church in the Beaumont, Texas, area. Beaumont is the county seat of Jefferson County and is about 25 miles north of the Gulf of Mexico. Its economy boomed with oil and shipbuilding.
There is just one Robert G. Church that I can find in the index of Texas deaths, with his death recorded as occurring on October 7, 1944, in Jefferson County. This may be the same Robert G. Church.