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I tried to find Elsie and the children but didn't find anything or found too many with the Peterson surname.
I'd contact the Contra Costa County Historical Society, cocohistory.org/frm-start.html , who does research and ask them to look up the names in their city/county directories.
I assume that George married around 1940 and the children were born after that date. It's going to be difficult to find them since the information you have goes back to 1966. Successful Searching!