Well since I was on the Calvin side, I don't know too many of the Hiltbrands, except Bob and Maxine, Walt's children and my first cousins. I just saw Bob Hiltbrand yesterday at my Aunt Bertha's memorial service. Bertha was Arlene and my mother's sister, passed away at 97.
Bob did tell me that his Uncle Bill died on Christmas morning. Bill was Walt's brother and since he was single, often attended Calvin family get togethers with Walt and Arlene's family, so we all knew him.
With your permission I could forward your comments and e-mail address to Bob, so he could contact you if he wants to. He has not been working on genealogy, and doesn't have subscription to Ancestry.