Coveney's of kilbrittain

I am searching for information on my ancestors the Coveney of Kilbrittain. I've birth records for my great grand father and his siblings but not a marriage record. The parents were Edmund "Ned" Coveney and Mary Scully. The birth records I found are: Catherine 7/1816, John 11/12/1818, Edmund 6/21/1821, Daniel 12/10/1828, Margaret 7/14/1831, Norry1/25/1835 and my great grandfather Denis M. Coveney 10/18/1838. Dennis immigrated to the U.S. about 1864. Any additional information would be greatly appreciated. Debbie.