I presume you have been to PRONI wills and seen that Robert of Lisnisky who died 1897 is the father of Elizabeth (Dilworth) McKee. I see a marriage of Robert and Margaret, no parents and no location given at Seagoe Parish church but Ann Dilworth, his daughter, was baptized by Robert and Alice in 1833. Other children include Robert, Mary Jane, Elizabeth, William, Margaret, Rebecca, and Rebecca. The last Rebecca survived and married John Ward, Elizabeth m. Alexander MCKee and son Andrew is mentioned in the will, William m. Hannah Thompson, Ann m. Thomas Rogers, I think Robert m. Alice Wilson, Mary Jane m. David Porter and George Liggett.
Several people have the Dilworth/Porter line. I don't know if they have been able to link Robert to other Lisnisky Dilworths Thomas and George or to Thomas's father Thomas.