Christopher, It looks like Civil Registrations on Family Search only have Registration District and not County. So results or lack of would depend on what you included in your search criteria. You use the term "death certificate" for Mary. Is this an actual certificate or just an online record? I'd use those same location details to search for the death of James. It also helps if you say where you've searched and what criteria you've used. Did you try both the White and Whyte variants? You might like to try http://www.irishgenealogy.ie/en/ Peter