Going back to parents Patrick and Bridget I have done a crossmatch search with data from the CastleGarden website to see what I can find out. Unfortunately, CastleGarden doesn't seem to have a facility to search the lists in the order they were written, so I cannot tell whether or not the names are linked (they may be members of entirely separate families, or siblings, or travelling alone!) Is there a Rootschatter who knows a good site where either the original lists are viewable or they have been transcribed in the order in which they were written?
Anyway - here is what I have found (discounting people under 16 at the time of the voyage and people with an estimated birth date well outside those shown on censuses):
Catherine - arrived 22 Feb 1850, on board Pat Carney 17, Bridget Carney 16
Shannon - arrived 3 Mar 1851, on board Patt Carney 20, Bridget Kenney 20
The Queen - arrived 25 Dec 1851, on board Patrick Coney 18 and Bridget Coney 22
Irvine - arrived 28 Sep 1852, on board Pat Kenny 22, Bridget Kenny, 22
Otseonthe - arrived 17 Oct 1853, on board Patt Carney 17, Bridget Carney 18
Western Empire arrived 23 Jun 1854, on board Patt Kenney 21, Bridget Kearney 17
James Nesmith - arrived 28 Aug 1854, on board Patt Connay 7, Bridget Carney 20
Conqueror - arrived 16 Nov 1854, on board Patrick Kearney 22, Patrick Kenney 24, Bridget Kenney 22, Bridget Kenney 17
Fidelia - arrived 26 Jul 1855, on board Patrick Kenny 21, Bridget Carney 18
John Bright - arrived 24 Apr 1858, on board Patrick Kinney 22, Bridget Kerney 18.
I have to say that I am not convinced that any of the above are the couple in question - my gut feeling (generally my gut is an unreliable source!) is that Patrick and Bridget may have married in the USA.
All the best
Philip