Mckim/Mckimm

Hi all, i'm trying to research my Grandmothers line. Finding it difficult due to the records in ireland being partly destroyed. if anybody can help it would be great...this is what i've got so far:

John Mckim/Mckimm (B:1859 D:?) married Margaret Colhoon/Colhoun (B:16/01/1861 in Co.Donegal, D:?)  in Ballynagard on the 4^th Feb 1886 by the Rev. Robert McCreery at The Presbyterian Church Ballyarnet Children known are Jane (B:1887,D:?), John(B:20/03/1889 in Ballynagard D:?), James(B:1893,D:?), Mary Ann(B:1894,D:?), Robert(B: 1897,D:?), William(B:28/08/1898,D:?), Isabella (B:1907,D:1955).

I have not yet found birth records for John born 1859 but i have his father named as James Mckim/Mckimm.

My Grandmother was Isabella but unfortunately i never got to meet her. She Married my Grandfarther Harry Bennett in Rochdale Lancashire and had two sons....Allan and Eric. Eric being my father.