I had a quick look on the 1901 Ireland census (website
www.census.nationalarchives.ie) and there are the following Hughes living at Cathedral close.
James Hughes aged 12
Owen Hughes aged 26
Catherine Hughes aged 24
Mary Jane Hughes aged 38
Mary Ellen Hughes aged 11
Mary Jane Hughes is the head of family in 3 Cathedral close a widow and a servant, James and Mary Ellen are her children and scholars. She is born in Tyrone the others in Armagh.
Owen and Catherine are husband and wife he is a labourer she is a housekeeper both from Armagh.
Hope this is of help. You can also look up the 1911 census at the same website.
Sarah