McKiernan in Cavan and Ireland as a Whole

Hello,

I have been attempting to research my family tree and I have run into a dead end in Ireland. If anyone could assist me in finding more direct ancestors I would really appreciate the help. Here is the information I have. 

The information is laid out as oldest ancestor I have to youngest, father to son

Patrick Kiernan or McKiernan
Born 1830 Cavan Ireland

Possible wife of Patrick: Ann?

Son of Patrick

Charles P McKiernan
Born 1852 Shantamon, Ireland
Married Bridget Brady on 01/24/1874 in Ballyhaise, Cavan, Ireland
Died 1897 in Boston MA, USA?

Wife of Charles P McKiernan
Bridget Brady
Born 1852 Cavan, Ireland
Died 05/28/1928 Boston MA, USA

Children of Charles and Bridget 

Mary C McKiernan
Born 01/27/1875, Ballyhaise, Cavan, Ireland

Ellen Elizabeth McKiernan
Born 11/16/1876, Ballyhaise, Cavan, Ireland

Patrick Charles McKiernan
Born 06/26/1880, Ballyhaise, Cavan, Ireland

John Lawrence McKiernan
02/12/1882, Place of birth unknown