I don't really take much notice to the Beatles' offspring, but I've heard some of Dhani's songs and he's a great songwriter.
The one person who I think gets a lot of unfair flak, though, is Sean. People have their own opinions, I know, but I've seen people hate on him just for being Yoko's son. You can't control who your parents are. John was shot when Sean was - what - six?
I really like his song Parachute, as well.