Looking for cousins Belfast, Griffin, Jackson, Falloon, Milligan?

I was in Belfast last month looking for some cousins there. They would be related to the Griffin family, Catherine, Adam, Mary and Rose that lived at 11 Crocus St from 1890-1929. Jackson family from Dromore Co. Down. The Griffin amily was from Ballymena. Also the relatives of Mary and Gerald Falloon and Lena Milligan. I know my grandmotherborn in Belfast) used to go back to Ireland to visit relatives in Ballymena.