I see the family in the 1911 census in the townland of Drumgor. James Byrne was a farmer and JP (Justice of the Peace). Being a JP indicates that he was a person of considerable standing in the community. He would have been authorised to issue search warrants to the police and other similar local administrative matters. So highly respected in the local area.
http://www.census.nationalarchives.ie/pages/1911/Armagh/Kernan/Drumgor/298486/
The 1911 census tells us that James had 6 children and that all were alive in 1911. Annie’s maiden name was Lavery so, Susan, the visitor in 1911 was probably a relation of hers, especially as both were born in Co Antrim.
James’s first wife was Catherine Burrell. They married on 28th July 1892 in Drumcree, Portadown.
https://civilrecords.irishgenealogy.ie/churchrecords/images/marriage_returns/marriages_1892/10641/5876911
Charles Byrne was born to that couple on 21.5.1893 in West St, Portadown. James was a spirit merchant. (He ran a pub).
https://civilrecords.irishgenealogy.ie/churchrecords/images/birth_returns/births_1893/02308/1865408
Household in West St in 1901:
http://www.census.nationalarchives.ie/pages/1901/Armagh/Portadown_Urban/West_Street/1030695/
Catherine Byrne died on 28.10.1905 as a result of an accidental haemorrhage. There wasn't an inquest. See:
https://civilrecords.irishgenealogy.ie/churchrecords/images/deaths_returns/deaths_1905/05582/4568063
James Byrne’s second wife was Annie Lavery from Aghagallon, Co Antrim. They married in Belfast on 19.9.1906. James’ father was Charles Byrne, a farmer.
https://civilrecords.irishgenealogy.ie/churchrecords/images/marriage_returns/marriages_1906/10132/5686590