It's really sad you've been told you can't choose your child's future. My wife has just re-inquired and a Guangdong office has suggested an application to renounce her and my son's citizenship. As this was done by phone and as my wife omitted some, to me important, questions, we are contemplating a follow-up. I'll let the board know later whether there in fact is an application (for under aged) and what it all takes to give up the honorable Chinese citizenship.

Cheers and beers