To Grillo, Ram and Steve:
No, seriously, Grillo, we're not supposed to curse here. Mike doesn't like it and most of us agree.
As to the ORIGINAL question - I think Let 'Em In is aboutletting people/music into your life. Phil and Don are the Everly Bros. I think Sister Suzie is Linda's sister-in-law and Brother John is her brother. It's one of my favorite songs!!