Hi,
Thank you for your message.
A very useful website for help researching your family tree is the http://www.irishtimes.com/ancestor
Here they allow you to search for a surname, the results returned allow you to see how many households had a particular surname in the mid-19th century in Ireland. It also shows you what counties the households were in. However to see specific parishes there is a small fee. Leitrim was listed as one of the counties which had both Flynns and McLoughlins in the same parish between 1848-1864. To see the results of the search follow this link:
http://www.irishtimes.com/ancestor/surname/index.cfm?fuseaction=Surname2&UserID=
You could also check church records. As you know that Catherine was from Mohill, you may be able to find her baptismal cert. Perhaps you could also check if there is a baptismal cert for Patrick in these records also? Most Catholic records are held locally, however the irishtimes websites gives an overview of what records are available in specific parishes. For Mohill Parish follow this link:
http://www.irishtimes.com/ancestor/fuses/rcparishmaps/index.cfm?fuseaction=showidrecords&CityCounty=Leitrim&parish=Mohill&churchid=175
For Church of Ireland records check:
http://ireland.anglican.org/about/42 and http://www.nationalarchives.ie/.
You could also do a search for Patirck's parents in the land records pertaining to Ireland in the 19th century. However, it may be difficult to confirm which results are relevant to you if there are multiple results returned. There are two:
The Tithe Applotment Books (1823-1838) found at http://titheapplotmentbooks.nationalarchives.ie/search/tab/home.jsp
and Griffith's Valuation (1848-1864) found at http://www.askaboutireland.ie/griffith-valuation/
It may also be a good idea to look into Patrick's emigration? Do you know much about it? Generally more information was given at the port of arrival rather than that of departure, so this may be a place to find more information-and perhaps even an exact place of origin. For immigration records in the US check the National Archives at http://www.archives.gov/
It is most likely that he arrived at New York, so he probably was processed at Castlegarden. You can search their database here:
http://www.castlegarden.org/
Some other websites which may help are:
The National Archives of Ireland http://www.nationalarchives.ie/genealogy1/genealogy-records/introduction/
The National Library of Ireland http://www.nli.ie/en/family-history-introduction.aspx
The National Archives UK ? genealogy search: http://www.nationalarchives.gov.uk/records/looking-for-person/
The Public Records Office of Northern Ireland http://www.proni.gov.uk/index/family_history.htm
Family Search: https://familysearch.org/
Genealogy Links: http://www.genealogylinks.net/uk/ireland/leitrim/index.html
I hope that these suggestions help. Remember to post any new information that you find. The more information you post, the more likely it is that one of our volunteers will be able to advise or assist you. Also include information concerning which sources you may have already used so others may further your search.
Kind regards,
Genealogy Support