Are you linked to this line? It looks like a fairly good match for my great, great grandfather William Adair born about 1843 in Ireland. He came to the US in 1869-1871 with his wife Ann Jane Stevenson Adair and 6 month old son Henry Adair. He later had a son Robert and a daughter Mary. Henry was born in Belfast which is in Antrim.
My grandmother wrote a book in which she said that her grandmother (Ann Jane) would not come to the US unless her sisters and their husbands came too. I think I have located her brother John A Stevenson living near her in Henderson County, Illinois. I am trying to identify families of her sisters in the census records.
I would really like to find records of this group in Ireland and also records of their trip to the US.