HARRINGTON & DOWD

I am searching for any information about the family and descendants of William HARRINGTON (b. abt. 1829 d. 1884)) and Mary DOWD. Harrington  (born abt. 1829 d. 1924). They lived in the town land of Acres, in/near Ballinameen.

Through a Roscommon message board, I have found out that they had nine children: 

Peter b. 1851, Mary b. 1853, Margaret b. 1856, Edward b. 1858, Catherine b. 1861, Sara b. 1865, William b. 1867, Rose b. 1871 and Patrick b. 1874 d. 1951(?).

Mary lived with her youngest son Patrick until her death in 1924. 
I know that at least three of the children emigrated to the US - Catherine, Sara and Rose.

I have not been able to find out what became of the other five siblings or the parents or siblings of William and Mary.  Can anyone provide me with any additional information on the family? It would be most greatly appreciated!

J. Cole

USA