Can't find notes/chords in the usual places, but here's a recording by Gerry O'Connor:https://myspace.com/gerrybanjooconnor/music/song/song-for-pj-37491646-39562263

This page says that Gerry O'Connor and the Dublin Legends are former members of the Dubliners, and “Song For PJ”, was written by Gerry in memory of his father-in-law .