Looking for Trainor relatives

My grandmother was Rose Trainor who I believe was born in Ballymoney in approx 1887. Her parents were George Trainor and Elizabeth Shiels. Her siblings were (probalby) David, Catherine or Kathleen, John, Jane or Jean, Elizabeth or Lizzie, and Mary.

Rose married John McGrath, Belleek, Count Fermanagh in approx 1908. They had six children whom I believe were all born in Rathfriland. Their names are Josephine or Mary Josephine, George, Elizabeth Winnifred (my mother), Rose, Kathleen and Patrick Gerald who died at birth along with Rose.

My mother and all of her sisters moved to Canada. My aunts did not have any children. I have not found any children of George who I believe moed to London.

I am looking for relatives on my grandmother's side and through research, believe there may be some in Belfast and/or Balleymoney.