Thanks for your information looking at it I saw that Humphrey and Mary O Sullivan were married in 1859 but Jeremiah and Julia Murphy 1st child was born in 1857. Having checked the church records I believe Humphrey Murphy is Jeremiahs brother the son of Patrick Murphy and Margaret Dalton who were married in Killarney in July 1928. Jeremiah being born in 1829 to them. So yes we are all descended from the one line.
Thank you so much for your help and time