In counseling, they won't be allowed to. Everyone will have a chance to speak.
Not every therapist will be fair or just about negotiating the situation. Additionally, when one specific individual of the group (the parent) is the one paying for the service, well, if the parent wants a therapist who will side against the child they can get easily one.
The world isn't so idealized that councilors are religiously devoted to neutrality and are unswayed by money, and the law is applied equally and fairly between all parties. The real world is more gray than that, and most comments seem to be assuming that laws are fair, will be applied fairly, and that all councilors will be unbiased and neutral.