Harold,
I contacted our county's historical society for help because they have phone books dating back forever. It took them over a week to reply and when they did, they said they were shorthanded and suggested you contact NARA.
I looked up these family names and found 1 Briseno listing in my phone book, and left a message today for him to call me.
There is no Hildeman listed in the phone directory, but a Hilgeman only.
The 1930 census info lists both of these families living in Waukegan. I'm going to the Waukegan historical society next week (my current plan). I'll see if there are any obits for these families. If there are, I'll send them to you for further follow-up.
Barbara