Lyric discussion by songyone 

I don't know if I'm reading things into this song that aren't there, but to me he is speaking to his older brother who has disappeared for a couple of years and comes home in pretty sorry state. The singer doesn't remember him as he sees him now. It seems the brother is suffering through something, possibly drug addiction or maybe just a unhappy life, and has done this before - come home and relied on his family while he gets himself together. There is a longing on the part of the singer to help, but he realizes there is nothing he can say or do to help his brother.

I agree with songyone. When I heard this song I immediately came to this conclusion.

'Penniless and tired, with your hair grown long I was looking at you there and your face looked wrong' Implies an evident change in appearance - unkept and not for the better as goes with drug addiction.
'Memory is a fickle siren song' He is alarmed by what he rememebered and what is now in front of him. 'You don't say a single word of the last two years' - he's feeling shame/nothing positive to say.

@songyone I believe you're right on target. I totally identify with this song, not as the "vagrant" brother but as the one who can do nor say anything that will change him.

I believe I gathered the same thing about the song as you did. Oddly, I was able to compare the song to my own life some years ago.... I had a friend that was like a brother to me and he saw me about a year after my addiction had started but now it was worse of course. And I was clenching 20 dollars (2 rolls of quarters) in my hand tighter then a punching fist. My friend was naturally confused why I would just let this addiction consume me when I was somewhat...

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