When our Simon ran away at the age of nine, we thought we would never see him again. But we’re so proud of him! Our boy is all grown up now. If you see our Simon, tell him his parents love him very much and we miss him, too.
I would have to guess that they’re either very proud that he’s made such an impact on the world of music (even if it’s only a small one if you compare it to all of music)...
Or they just don’t understand the music very well.
Can’t really think of any other situation that could be plausible.
Or they could be old hippies who encouraged Si’s exploration of the mind and they sit down every morning on the back porch and smoke a bowl, sit back and revile in their sons genius.