I think people are confusing HIPAA with the child's right to privacy in counseling sessions. What CourtClerk is talking about is not the HIPAA regulations (which bind the PROVIDER to keep the child's privacy), but rather the MORAL obligation to allow the child privacy in their counseling sessions so that they can feel safe in those sessions and not feel any fear or intimidation that their parents will violate that privacy such as pumping them for info and that sort of thing. Whether there is a statute protecting such rights, I don't know as that would vary state by state. There is also the dimension of this counseling being associated with a family court order and the court would naturally show concern if it appeared that one parent was involving themselves in the private counseling of the child from affair. This is not to say the child can never share the same thoughts and feelings with a parent that they share with a counselor, though.
In the state of CA, there is something (can't remember the statute or law right now) that protects the privacy of the counseling session.
My daughters have all been to see a counselor. The first session was a "ground rules" type of session. Basically, the child can determine if he/she talks about what happens in the session. We, as parents, are not privvy to that information UNLESS the child wants to talk about it, OR if the child is a danger to themselves or others the counselor is obligated to inform the parents/authorities.
There have been times where my daughter wants to talk about what was said and many times where they don't. I don't push etc.
Also in reference to the court order issue, when I did intake sheets on all our kids for counseling the forms asked what the court orders were in regards to custody and visitation etc.