Have you really thought about how your ancestor' s was different from your own? Things have changed since your deceased ancestor was alive. Some changes are big and some are small. I haven't used directory information for years, if I need a phone number for a business I simply "google" it on my blackberry, click on the phone number and dial. Ten years ago I couldn't do that.
And maybe when you think about how your ancestor's is different from your own, you will realize there is something about that ancestor you have overlooked.