Seeking Help with McBlain Family Tree

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Hi
This is my first posting and I hope someone will be able to help me. I am looking for information on Stewart McBlain married to Mary Dolan in 1866 in Newtownards, Northern Ireland. His father was called John but cannot find out who John's wife was. He had brothers/sisters from West Coast Scotland. Family spread all over Scotland for all time scales. Have hundreds of McBlains details but struggling to put together and have big gaps. any help much appreciated.