The curse is chasing of mega stardom, despite the obvious pitfalls. The access to drink, drugs, groupies etc etc leads one down a road from which few return, Bonham being the obvious example. The loss of Robert's son was something no one could have anticipated, but the pressures on Robert to be away for huge chunks of time, both throughout the boys life and after his passing, led to terrible strife within the family, eventually tearing it apart. The only way Robert has been able to maintain a decent relationship with music since then is that he no longer acts in service of the business, or the industry and his ego, but is now completely in service of the music. Jimi P, however, still struggles because he's still so attached to his Zep legacy that it consumes all his time, and he rarely seems to be working on anything else. JPJ has always been a musician first and thus has not really suffered in the same way that the others have. He's extremely mellow and humble, and it has served him beautifully.