Looking for Cullina Quinns of Irishtown CO Mayo

I am looking for my relations in Irishtown, Co. Mayo. My gggrandfather, John F Cullina b 1868, Cristianed June 1968 in Ballindine, Mayo, came to Chicago and settled in about 1889. His parents were already in Troy, New York, living. They had come over in 1869. They were Pat Cullina b abt 1844, and Bridget Quinn b abt 1842. They left John behind in Ireland to be raised by ???? I don't know who. I need information on the parents, siblings and extended family of both, Pat and Bridget. If anyone can help, I'd be most grateful.
Theresa Cullina