Hello Sir,

1. There will not be any issue in NEET counselling for your son in All India Counselling. But there might be an issue when you go for other state counselling. In your own state and in All India Counselling the birth certificate and community certificate will be acceptable.
2. Parents' community certificate is not required if the student has his/her own community certificate. Need not to worry about it.
3. As the community certificate of parents' is not required hence there is no need to panic about the original or xerox copies.

All the best!