I just heard The Orphans' Song, which is in the DT. The link is already in the list near the top of the page. It's an Andy M Stewart composition set around the time of WW1 or shortly thereafter

https://www.youtube.com/watch?v=VfoVRrQSYmo = Andy Stewart from a 1982 album. You can also find recordings by other singers, including Niamh Parsons, Celtann, Georgia Lewis etc

I read that the song was based on a true story.

Similar upsets still occur. I recently read a newspaper report about a couple who were dating and who split up after they found out via DNA testing that they were cousins. As far as I am aware, marriage between first cousins is not illegal; and these were second cousins. But they were too "freaked out" by the revelation.

No-one has replied yet to John P's post of 28 Nov 03. Johnny Be Fair is Buffy Sainte-Marie's version of a widespread song also known (and noted in the discussion) as Shame and Scandal.