Conversation so far:
What did The Clancy Brothers do in the late 1980s and 1990s?
In 1988, the Clancy Brothers (Paddy, Tom, and Bobby) with Robbie O'Connell recorded a poorly mixed live album at St. Anselm College, Tunes 'n' Tales of Ireland.
Did The Clancy Brothers have another album during the late 1980s and 1990s?
Released in late 1995, Older But No Wiser introduced all newly recorded songs with the exception of When the Ship Comes In, which the group performed at the Dylan concert.
Was the The Clancy Brothers album Older But No Wiser successful?
Patrick Street, writing in the magazine, Dirty Linen, called this last Clancy Brothers album probably the best studio recording of their distinguished career.“
Did any new members join The Clancy Brothers during the late 1980s and 1990s?
On the album Older But No Wiser and the concert video Farewell to Ireland, two sons of Clancy brothers made their recording debuts.

Question: Who were his sons?
Self-contained rewrite: Who were the two sons of Clancy brothers that made their recording debuts on the album Older But No Wiser?