Given that the Callbook is arranged to look up by callsign, and not by name , it may take you more than a week. If you have access, old family pictures showing his station or vehicle may give a clue , or contact a club in the area where he lived, and one of the old-timers may remember him. The "Old Old-Timer's Club" lists past and present members on their website . You can look them up by name .
http://ootc.us/