Looking for the Sullivan

I am looking for information on John Dennis Sullivan and spouse Norah (Sullivan)Sullivan of the parish of South Kilcaskan, county Cork. Also Timothy Sullivan and spouse Mary (Murphy)Sullivan. Also Dennis Sullivan and spouse Norah (Sullivan)Sullivan. I have the following information on thes individuals:

Dennis Sullivan was born in County Cork with 5generations of his family born in the same parish. He was a farmer of South Kilcaskan and there he died in 1872 at the age of 72. Bd about 1800. His wife Norah Sullivan of the same parish  died in April 1910 at the age of 94.

John Dennis Sullivan, son of Dennis and Norah Sullivan was born in South Kilcaskan Dec. 26, 1832 and died in Newport, RI , USA  April 11, 1911. His wife Norah (Sullivan ) Sullivan was born in the same parish Dec. 24, 1840 and died in Newport, RI,USA October 7, 1888. She was the daughter of Timothy and Mary (Murphy) Sullivan

Mary (Murphy)Sullivan immigrated to the USA after her husband's death and was a domestic servant in the household of the Easton family of Newport.

Is there any John Sullivan and Timothy Sullivan in this family that immigrated to the USA before 1840?

Norah