Hi There,
I dont want you to get your hopes up, but you are taking a great leap of faith that you will find your family in co Cavan,.
I looked up the NationaArchives.ie for Galligan a publican & I found this
http://www.census.nationalarchives.ie/pages/1901/Cavan/Cavan/Main_Stree…
he is still there in 1911
http://www.census.nationalarchives.ie/pages/1911/Cavan/Cavan_Urban/Main…;
If this man ever married & had any more family I dont know, if you wished to search his details you could try
1. Civil registration records are available from the General Register Office (GRO). These start from 1864. You can access the website here:http://www.groireland.ie/research.htm
2. You can look up familysearch.org (free site)
I suppose you would be looking to eliminate him & his family & if there were still some Galligan males alive in your family & his DNA tests would prove that you were related but not how.
3. You could also try contacting the Cavan Co. Library for further assistance
Cavan Genealogy,
1st floor,
Johnston Central Library,
Farnham Street,
Cavan Town,
County Cavan.
Tel: +353 (0)49 4361094
Fax: +353 (0)49 433149 email cavangenealogy@eircom.net
If I was you I would focus my research on as much as there is in US, search all the family, all their information, track the sisters, did they name their homes after a place in Ireland, any obituaries, wills, search for anyone that may have come to live with them, they may have brought family or neighbours over after them, do all the census & look at the original transcripts, someone may have written a place that is so obsure that the transcribers may have overlooked as they may not have recognised the word. Check all the sites that records travellers ie. Ellis Island site, Castlegarden.org if they came from Ulster, they may have travelled through Canada. Dont dismiss that they could have lived in UK even for a short period & some left for USA from UK. You are looking for a place in Ireland & also loo for any prayer books, bibles etc. Talk to any of your family & see if they have any stories, you never know what they turn up.
Good luck with your search & if you find they are in Co Cavan I would love to meet you here & show you around.
Let me know if you have any success, so I can further help others..
Best Wishes Carmel O'Callaghan