Here is the link for the Italian white pages www.paginebianche.it/index_en.html
you can search for your surnames in your fathers town. If you find people with the same surnames you might want to compose a letter explaining who you are and who your father and grandparents were. Ask if by chance you are related and see if you get any response. Your letter should be written in Italian so I would compose it in English and then post to the translation forum here on Gente and ask for translation help.
With a little luck you may get some replies. Hope this helps.