askthe lady was Croatia part of italy when he was born? Did she know if he went to Argentina before or after World War 1.Did the lady know the namehe town in croatia he was born in or the province?DEoes she know if he had relatives in Afrgenitna (there are just 2 persons surnamed ILIC in the telephone diorectory and maybe nieces or nephews or cousins?? Onbe small piece of family inofrmation could give you so jmyuch information you never would know since you are not familiar with genealogy. Do you know the name of the boat he went to argdentina with? Did he go with comebody she knows?Was he ever in the USA?
In short ANYTHING even a post card from him swould help from the date stamps...Petertimber