Barretts from Derreennacno, County Cork, Caheragh Parish

I am trying to find out if my greatgreat grandfather Richard Barrett b.1849 who married Julia McCarthy b. 1846, had brothers Patrick, b. 1856, Robert b. 1858, and James b 1841. I am trying to confirm their parents as Richard Barrett b. 1823 and Margaret Leary. Also trying to find more information about the children of Patrick who I believe married Mary Holland b. 1866.

Thank you,

Susan Barrett