Thank you for your message. Some sites & services for County Waterford genealogy which might be of assistance to your search are:
There is lots of useful information to be found in the 1901 and 1911 census records. You can find this here: http://www.census.nationalarchives.ie/search/
Remember to post as much information as you can with regard to the people you are researching. The more information you post, the more likely it is that one of our volunteers will be able to advise or assist you. Also include information concerning which sources you may have already used so others may further your search.