It can be a maze searching through records in the US to find that elusive place of birth for our emigrants. And of course even more challenging in Ireland since we have so few surviving records.
As I mentioned since Thomas was born so early there may not be surviving Roman Catholic parish records for his birthplace. Since the children were also born in Ireland there's a possibility parish records for their birth locations may more likely have survived.
Catholic Emancipation didn't start in Ireland until 1829 and it was really after that date you'll find many of the churches were built and the records begin.
County Tipperary is divided into two parts, the North Riding and the South Riding.
You'll see it on the County Tipperary civil parish maps:http://www.ireland.com/ancestor/fuses/civilparish/index.cfm?...
Here's a link to the Roman Catholic Parish maps for County Tipperary. If you click on each of the parishes on the map you'll see how far back the records go for that parish and where and how they can be accessed. http://www.ireland.com/ancestor/browse/counties/rcmaps/tippe...
The Roman Catholic Diocese of Cashel and Emly, which includes the majority of parishes in County Tipperary, has recently closed access to parish records to the public. Microfilm copies of all the parish registers had been at the National Library of Ireland in Dublin City but have been removed so no one can look at them.
Access is now only through paid research by the Tipperary Heritage Centres.
If you look at the Roman Catholic parishes in the southwestern part of the South Riding you'll see the County Cork border is there. There's always a possibility with any parishes on the county borders that people had records in one county but actually lived nearby in another county.
But of course there's also the possibility they lived elsewhere in County Cork but unless there was a baptismal or marriage entry in one of the Roman Catholic parish registers in County Cork there's no way to find where they might have lived since there are no surviving census records before 1901.
They also could have sailed to Liverpool from County Cork to get the transatlantic vessel to the US.
County Cork is the largest county in Ireland area-wise. Here's a link to the Roman Catholic records for all the parishes in County Cork and again if you click on each parish map you'll see the dates of the records and how they can be accessed.
Any Roman Catholic parishes in County Cork that are part of the Diocese of Kerry require permission from the Bishop of Kerry to look at the microfilmed records.http://www.ireland.com/ancestor/browse/counties/rcmaps/corkr...
If you look at the Roman Catholic Parish records in both County Tipperary and County Cork and when in the specific parish link, look on the very bottom left and you'll see a further link to the names of the civil parishes included in that Roman Catholic parish.
Here's a link to the maps of the civil parishes of County Tipperary and County Cork:
To find which town/townland in each county is in which civil parish you can search the townland name at http://www.seanruad.com
by selecting each county and then looking at the list which includes the civil parish name for each town or townland.
From historical records I've read about Liverpool and Irish emigrants who left from there during the Famine (1845-50), the conditions were horiffic. Hundreds of thousands of them languished on the Liverpool docks for weeks waiting for an outbound ship to the US (or Canada), they were taken advantage of by the locals when they tried to get supplies or food or even lodging while waiting for the next available outbound ship. Many died on those docks. You'll find some detail in the following:http://www.nde.state.ne.us/SS/irish/unit_5.htmlhttp://www.nde.state.ne.us/ss/irish/irish_pf.html
But overcrowding and illness were also common at any of the exit ports in Ireland where people were trying to find anything that floated to England to get away from the famine and disease.
What's amazing to me about the Famine emigrants is their resilience and success in the US coping with a new country and new ways especially after all they had been through during the Famine and their exodus away.
The Famine wasn't even talked about in succeeding decades in Ireland. There was collective amnesia about it because it was so horrendous. It wasn't taught about in our schools. It wasn't really until the 1990s with the 150th anniversary that those of you in the US (who had heard about the Famine in oral family history or studied it in school) began coordinating commemorations to observe it. Many books were written in the US during the 1990s (and late 1980s) about the Famine and that in turn spurred more research and books published in Ireland and even commemorations in Ireland.
The first recognised book about the Famine was written in 1960 by Cecil Woodham-Smith (an Englishwoman) called "The Great Hunger" and that was really the first glimpse into what happened during those Famine years.