Hello. I have just come across your request for information on Andrew Rea Gilchrist. I believe that the man you are asking about is my husband's 1st cousin twice removed. i.e. his grand dad's first cousin. You will find him on the 1911 census in Northern Ireland for Dromore Street in Ballynahinch staying with his mum (Catherine Hill Witherow)'s sister Lizzie Hamilton and her husband Dr Samuel Hamilton.Catherine's dad was Professor Thomas Witherow from Derry. He was a very notable minister and scholar, there is a wealth of information about him on line. If I can help you anymore I will be happy to, but this should steer you in the right direction. Kind regards, Sam