Know what you mean. The late-teens son of a mate of mine is in a fairly successful band -- they're getting a hell of a lot of interest, plays on national radio, festival invites, etc -- but without the substantial support and taxi/roadie duties of the band members' parents they would be nowhere. Almost every time I ask him what he's got on at the weekend, it's "oh, Ky's got a gig down in Plymouth/up in Birmingham/in the back of beyond, so there goes my Saturday...".
Thing is, neither he nor the other parents seem to get noticed until there's a problem, when suddenly it's "oh great, now what am I going to do?".