Anytime I've heard this song sung there is an extra verse at the end which isn't included in Ó Lochlainn or in Frank Harte's Songs of Dublin;

And now their family numbers ten and Mary's heart sings lke a linnet
For Johnny's tamed that wild young buck that stretched her patience to the limit
They're happy now in sweet Ringsend no more they'll sail for foreign waters
For Johnny Doyle his hands are full, with five strong and five sweet daughters

Any idea where this verse originated?

All the best,

Ian