Dear Mr. Lafferty;
I just noticed your post from 1999. Did you ever find your living Maher family members in Ballingarry? If this still reaches you, you are likely to find them on the Ballingarry Free Forums page which is http://ballingarry.freeforums(dot)org/
I visited Ballingarry Parish and Farranrory Townland last October. You've probably learned by now that the Mahers can be found in Griffith's Valuation in Ballingarry Parish, perhaps the ones you are looking for?