I'll be very interested in what you find out. Now, just saying these next things just in case but I'm sure you have thought of them too. Since he was brought to the US very young he may not know much at all about "our" Benny, but he may know any stepbrothers or stepsisters that can fill you in more. (with their names and the name of his stepmother!) And maybe he'll at least know when our Benny died (and if possible for me when his grandfather Vincente Diniro died). I did check this number against the 1990 directory one and this phone number is different. If it does not work let me know I may be able to have someone else look it up. Anyway, good hunting.
BTW you said you would be in San Antonio over Thanksgiving, do you live in Texas? I have a good friend in the Dallas area and we live just west in NM. Good luck, Beth (yes that is my nickname for Beatrice - long story).