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 in Goffstown, New Hampshire.
Did they have another album during this time?
Released in late 1995, Older But No Wiser introduced all newly recorded songs with the exception of "When the Ship Comes In".
Was the album successful?
CANNOTANSWER.
Did any new members join during this time?
On the album Older But No Wiser and the concert video Farewell to Ireland, respectively, two sons of Clancy brothers made their recording debuts.

Question: Who were his sons?
Self-contained rewrite: Who were Clancy brothers' sons?