Robert Macartney and Jemima Hill

I am researching the family of Robert McCartney and Jemima Hill who were married in 1873. They had 11 children; Sarah, Elizabeth (Lily), Jemima, Robert Allen, Ida, Jane (Jennie), and James among them born roughly between 1874-1887. I am not surge how many survived childhood, but I do know that 4 of them eventually made it to the United States; Elizabeth (married Gay Houston in Boston MA in 1904), Ida (married Samuel David McKnight in 1914 in Norwood MA) and had two children; Charles and Jane, Jane, who had a daughter, Elizabeth (my mother) and Jemima, who had one or two children. James stayed in Belfast. From my research I think that the older children were born in Dungannon, County Tyrone, one might have been born in County Down, and the others in Antrim or Armagh.

Any help would be much appreciated.