I was just looking for information on a Hugh Guthrie Egbert when I found this thread. The names you listed, Calvin and Roger, I know as my Father in Law's half brothers! the name of their mother Maxine Hutto confirmed this as this is the name my Father In law mentioned was the woman his father remarried.
If you still have any information on Calvin and what happened to them I would love to know. Please contact me. Many thanks
Sara