Patrick:
Welcome to ireland Reaching Out!
Not sure what information you are looking for. The 1855/1856 Griffiths Valuation head of hosuehold listing for Aghamore civil parish (first link below) showed a number of Grealy records but only one in Crossard.-- Patrick who was likely the father of Thomas. Do you have the civil marriage record from 1870?
I went back to the Tithe listings. The year is not shows but it would be late 1820s or early 1830s. Crossard was spelled Crissard and there were two Greallys-- Michael and Ed listed. (see second link).
I then located the 1901 and 1911 census records (third and fourth links). The 1911 census indicates that Bridget had twelve total children with ten living as of March 31, 1991.
Let me know if you have any questions.
Roger McDonnell
http://www.failteromhat.com/griffiths/mayo/aghamore.htm
http://titheapplotmentbooks.nationalarchives.ie/reels/tab//004587395/004...
http://census.nationalarchives.ie/pages/1901/Mayo/Coolnaha/Crossard/1594...
http://census.nationalarchives.ie/pages/1911/Mayo/Coolnaha/Crossard/736513/