Thanks LH, I will look into that side of things, I guess that means a visit to Dublin?
Shane, this is what I got from John's birth details from Irish Geneology.
Name JOHN HENRY BARR
Date of Birth 4 December 1845
Address 6 JAME'S STREET EAST
Father ANDREW BARR
Mother ELIZABETH
Further details in the record
Father Occupation Rope Maker
His mother was Elizabeth Wheeler as I found Andrew and Elizabeth's marriage details too.
At the time of John's birth, Andrew's address would have been 6 JAME'S STREET EAST , Dublin and he and Elizabeth married at Diocese of DUBLIN , Parish of ST. PETER'S C.of I.
I wouldn't mind betting that he might have worked for someone else and that is why they don't appear in the trade directory.
I have found four of my Scottish ancestors in trade directories but we always knew they were successful business people. Other than a tradition of ropemaking, we know nothing more the Barrs and their lives. I have to say that John's son Andrew, who was my grandfather was very well educated and was one of the first electrical engineers when electricity was still a bit of a dangerous mystery to most people! In turn, Andrews children were all bright enough and one was a high ranking soldier. Their was probably either money or brains somewhere in their ancestry