Answer by taking a quote from the following article:

The Dubliners were an Irish folk band founded in Dublin in 1962. The band started off as The Ronnie Drew Ballad Group, named in honour of its founding member; they subsequently renamed themselves as The Dubliners. The group line-up saw many changes over their fifty-year career. However, the group's success was centered on lead singers Luke Kelly and Ronnie Drew.

Drew spent some time in Spain in his younger years where he learned to play Flamenco guitar, and he accompanied his songs on a Spanish guitar. Drew left the band in 1974 to spend more time with his family, and was replaced by Jim McCann. He returned to The Dubliners five years later, but left the group again in 1995. Ronnie Drew died at St Vincent's Private Hospital in Dublin on 16 August 2008 after a long illness. Paddy Reilly took Drew's place in 1995. Some of Drew's most significant contributions to the band are the hit single "Seven Drunken Nights", his rendition of "Finnegan's Wake", and "McAlpine's Fusiliers".  Luke Kelly was more of a balladeer than Drew, and he played chords on the five-string banjo. Kelly sang many defining versions of traditional songs like "The Black Velvet Band", "Whiskey in the Jar", "Home Boys Home"; but also Phil Coulter's "The Town I Loved So Well", Ewan MacColl's "Dirty Old Town", "The Wild Rover", and "Raglan Road", written by the famous Irish poet Patrick Kavanagh. In 1980, Luke Kelly was diagnosed with a brain tumour. Occasionally Kelly was too ill to sing though he was sometimes able to join the band for a few songs. While on tour in Germany he collapsed on stage. When Kelly was too ill to play, he was replaced by Sean Cannon. He continued to tour with the band until two months before his death. Kelly died on 30 January 1984. One of the last concerts in which he took part was recorded and released: Live in Carre, recorded in Amsterdam, Netherlands, released in 1983. In November 2004, the Dublin city council voted unanimously to erect a bronze statue of Luke Kelly. Kelly is buried in Glasnevin Cemetery in Dublin.  Ciaran Bourke was a singer, but he also played the guitar, tin whistle and harmonica. He sang many songs in Irish ("Peggy Lettermore", "Preab san Ol"). In 1974 he collapsed on stage after suffering a brain haemorrhage. A second haemorrhage left him paralysed on his left side. Bourke died in 1988. The band did not officially replace him until his death.  John Sheahan and Bobby Lynch joined the band in 1964. They had been playing during the interval at concerts, and usually stayed on for the second half of the show. When Luke Kelly moved to England in 1964, Lynch was taken on as his temporary replacement. When Kelly returned in 1965, Lynch left the band and Sheahan stayed. According to Sheahan, he was never (and still has not been) ever officially asked to join the band. Sheahan is the only member to have had a musical education. Lynch committed suicide in Dublin in 1982.

Who else was in the original band?
Luke Kelly