Hi Lynne, there is no need for apologies, do this for fun and I learn some social history as I go, lots of people do not reply at all, others become friends and even visit the area. I looked over the attachments you sent and they ask where you last lived so Louth it is, I think the marriage in Mellifont looks good in 1841 but has issues, the documents are dated 31st January 1849, this means that Catherine if married in 1842 was only 18 at best, also only one child between 1841 and 1849 as Thomas in 1845, there are few death records so he may well have died but there is no Alice birth, I do see some in the UK but none to suit. It also strikes me you mention only an Alice and a Hannah so were there only 2 children, very few for the times. they would have left Ireland just after the famine. When did John arrive and what does his record say, is there an age even. You can see the marriage here it is 1842 July, select event and year and month, you cannot search by name, the address is Hill of Rath, the church is near the town of Drogheda now in Mell, if you would like a photo of it I can take one when I next pass it, allow a few weeks as I live the other side of town. By the way Mell is the gaelic word for honey. https://registers.nli.ie/parishes/0231 Louth is in the catholic diocese of Armagh in case the Armagh confuses you. Catherine's surname has a lot of history here but the family were Church of Ireland or Protestant, I have seen some other RC marriages for Coddington too. By the way could see no baptism for her circa 1825 but there were a Michael and Richard born in 1827 and 1828, I did not check as to parents. Cain is not a name here now but Kane is. If you want a look at Drogheda in the old old days there is a 9 minut Youtube video Ghosts of Drogheda which is a nice view of very old still photos. the Codddington House and history, feel free to ask more about it or other sites. http://battleoftheboyne.ie/oldbridge/
In 1854 ish in Louth there was a detailed land survey and only Cains are in Carlingford. See http://www.askaboutireland.ie/griffith-valuation/index.xml?action=nameS…;
Got a smile from your Carr remark, my Granny was a Carr from Leitrim, if you are there there is a good chance we are related but the name is all over including Drogheda here. I have or had a good friend by that name at college and discovered a couple of years ago he has a Carr website, by the way I note that is is often changed to Kerr and back again) his site is here but get back when you know more. http://www.reunitedfamily.com/
If we can firm up on your ancestors there are more sites covering Ireland that may interest you.
Regards
Pat