Wow man, this is like, so '70's....

I came across this video from the '70's while looking for Celtic tinwhistle stuff. I couldn't help listening! I have no idea what they're singing about. It could even be something for mature audiences, but being a child of the '60's and '70's I just had to post it here! =0) Apparently, this is an Irish band that has been popular since the 70's. They are all relatives and are still recording and performing. They must be OLD! (About my age.)