Searching for Sheehan-Walsh and Looney-Cronin Ancestors

I am searching for information about Michael Sheehan from Inniscarra, County Cork, Ireland, born about 183O and his wife, Ellen or Nellie Walsh. They lived in the Curraleigh, Bridgestown and Coolatubrid townlands in the mid to late 1800's. Ellen may have had a brother John Walsh and other siblings.

Michael and Ellen had seven children that I am aware of-- Johanna (b. July 1859), Margaret (b. May 1861), Michael (b. August 1863), Ellen (b. March 1866), Patrick (b. June 1869), Mary (b. June 1872), and Robert John Sheehan, born 25 November 1878.  Five children immigrated to the United States in the 1890's and settled in Cambridge, Massachusetts-- Michael, Ellen, Patrick, Mary, and Robert.

Michael Sheehan, the son, married a Mary Looney (b. 11 March 1873) from Aghabulloge. The marriage took place in the USA. Mary's parents were Jeremiah Looney and Julia Cronin. Both were born around 1840.  Jeremiah's parents were John Looney and Hannah Minihan.  Julia's father was John Cronin and Mary Riordan, from Aghabullogue, too. 

Mary Looney had three brothers, John, Daniel and Jeremiah, and four sisters Julia, Hanora, Margaret, and Hannah. All of the children, but John, Jeremiah and Hannah, immigrated to the United States in the 1890's and setlled in Cambridge, Massachusetts, too.  

Robert Sheehan married an Elizabeth Delahanty in the USA and had a daughter, Helen Elizabeth, (b. 7 Aug 1908). Elizabeth Delahanty was from Rhode Island. They had a daughter, Helen, who married Bill Cleary from Cambridge.

Mary and Patrick Sheehan never married.Their sibling Ellen married an Arthur Higgins from Newfoundland, Canada. 

Any information about the Sheehan-Walsh families (or the Looney-Cronins) and their decendents would be greatly appreciated.