Need Info on James McKeown married to Susan Armstrong lived in Ireland

I'm looking for any information on James and his wife Susan.I believe they lived in Ireland all their lives.I have listed 4 children: James W., Susanna Rosetta, Anna and Mary.Susanna was b. 4 Feb 1819 in Ireland and died 1889 in Texas.Susanna married Andrew Marschalk.I'm trying to find any information on this family but I'm not having any luck.I think James might have been a minister.Any help would be appreciated.Thank you