Williams Family from Bandon

My 3rd Great-Grandfather, Michael J. Williams, arrived in the U.S. on St. Patrick's Day 1851  on the Ship E.Z.  from Liverpool.  With Michael (age 46) on the ship were:  Bessy, age 46 [born ca 1805 (wife)], Ellen, female age 15 [born ca 1836 (daughter)], John, male age 13  [born ca 1838 (son)], Michl., male age 11 [born ca 1840 (son)], Bessy, female age 9 [born ca 1842 (daughter)], Cathn., female age 7 [born ca 1844 (daughter)], Margaret, female age 5 [born ca 1846 (daughter)], and Johan, female age 3 months [opine Johanna, (daughter, and my 2nd Great-Grandmother)].  The family was joined in Massachusetts by another daughter, Mary, who was said to have married Patrick Corcoran in Ireland.  Bessy (also known as Elizabeth and Eliza) was later said to have been born in 1802.  Michael's gravestone says that he was a native of Brandon [sic], County Cork, Ireland.  I hope to visit Cork and Brandon in August 2013 and am hoping to find some records pertaining to the family before I do.  One Eliza Murphy, daughter of Dionesia [Denis] Murphy and Honora Leane, was baptized 14 Sep 1802 in Cork & Ross Diocese, Murrah & Templemartin Parish, according to Roman Catholic church records online.  In the same records I found that Michael Williams married Eliza Murphy on 27 Feb 1827 in Bandon.  I am hopeful that this is the family.  Any assistance would be appreciated!  Jacqui