Kennedy's from Buttevant

I am trying to trace descendants of my Great Grandfather Cornelius Kennedy who was born in 1844 in Ballyhea and married Catherine Carrol in Buttevant in 1869.

She died in Buttevant in 1903 and they had 9 children. Cornelius died in Buttevant in 1925.

I have traced 6 of their children but have little information about Ellen (1869), Mary (1879) and Catherine (1888)