Jean J Revels b 1907 had a brother Bert b abt 1912; this is probably him.
1940 Bert Revels 29, head; race Neg; b WI, car washer, General Motors Ruth Revels 23, wife; race Neg; b IA Bert Revels Jr. 3, son, race Neg; b WI
So that explains the earlier city directory listings that gave Gene and Bert the occupation of car washer - that would be a regular job at General Motors.
As you can see, as I posted more detailed information from more sources, it's clear this family is not white (as I had said), but rather inter-racial. Sorry about the mistake.
I haven't found the marriage record for Betty (Oswald?) and Gene John Revels (or Jean J. Revels).I also haven't found Betty's immigration in 1918 - perhaps her naturalization/citizenship papers would tell more about her. Probably her name as found in American records is "Americanized."
I checked into Hiram Rhodes Revels VERY briefly. He fits the family in this thread, though I don't know if he's related. He was born 1827 in Fayetteville, North Carolina - and the Nancy Revels in this thread was born about 1825 in North Carolina. Like the Revels in this thread, he was mixed race. His father was a free man of both white and black ancestry, and his mother was white, of Scottish heritage. He studied theology in Ohio, and Nancy Revels in this thread also lived in Ohio. Some interesting parallels so would be worthwhile to check it out further. Also, in that post by Jill (I quoted her earlier), she said "I have been told that I'm a descendant of Hiram Rhodes Revels." Sometimes family stories like that are a little mixed up, but certainly that's suggestive of a possible family relationship of some kind. Speaking of Jill, it now seems to me she is likely related to "your" Jill. She refers to her father and says she'd like to trace his ancestry, but she doesn't say his name or date of birth. She does say she thinks he was born in Wauwautosa, Milwaukee, Wisconsin and that his father was Jean J. Revels who married a Hungarian woman and died in Toledo, Ohio.