Do you know much about their emigration? Dates, the reason why they left, etc.? Generally more information was given at the port of arrival rather than the port of departure. If you knew which city they arrived at (e.g. Liverpool), this could be a good place to find more information.If you haven't already - You could try checking the land records called the Tithe Applotment Books (1823-38) or the later Griffith's Valuation (1848-64) for the family.. The Tithe Applotment Books (1823-38): Microfilm copies of the books for all of Ireland are available at the National Archives of Ireland (NAI) http://www.nationalarchives.ie/genealogy1/genealogy-records/tithe-applotment-books-and-the-primary-griffith-valuation/ or the Church of Latter Day Saints (LDS). Griffith's is freely available here: www.askaboutireland.com or here: www.failteromhat.com Failte Romhat has lots of other useful links you could try looking at.
You might also try contacting:
Irish World Family History Services,Family History Suite,
51 Dungannon Road,
Coalisland,
County Tyrone,
BT71 4HP,
Northern Ireland.
Tel/Fax: +44 (0)28 8774 6065
Email: info@irish-world.com
Website: www.irish-world.com
Remember to post as much information as you can regarding the people you are researching. 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.
Regards,