Do I have to let police interview my child?
No. You are not required to make your child available for questioning, and declining is not obstruction.
The framing you'll hear is that they just want to talk, that your child isn't in trouble, that it will help sort things out. Sometimes that's accurate. Often the child is a subject, and an interview conducted without counsel produces statements that shape everything afterward.
What to say: that you'd like to speak with an attorney before your child answers questions, and ask for the officer's name, agency, and contact information. That's a complete and appropriate response.
What not to do: allow the interview because refusing feels uncooperative or looks like you think your child did something. It doesn't, and it isn't treated that way legally.
A child's statement carries enormous weight in these cases, and children are more suggestible under questioning than adults — a well-documented phenomenon.
If your child has already been interviewed, tell counsel exactly what happened, including who was present.
"We'd like to talk to a lawyer first" is a complete answer. Nothing more is required. ---
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