Believe it or not, it is entirely legal for law enforcement to interview a child without notifying the parents.
This question is actually pretty common. The child has the same rights as an adult--to refuse to cooperate, but naturally, the typical child is not sophisticated enough to do that.
The child can certainly refuse to answer any question by any law enforcement official always. That refusal can be contingent, or it can be absolute, but it is the child's right. Requesting to speak to a parent does not have to be honored from a Constitutional standpoint. As a fellow parent, I understand how counter-intuitive this is, but it is legal.
I understand the position that you are in, but please understand that I am in a position where I must provide accurate information, even if it is unfavorable. I am glad to answer any other questions that you may have. Was there anything else I could do for you this evening?
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