Am I required to cooperate in a child abuse investigation?

I work for the UAE in Washington, D.C. and maintain a high level security clearance. One of my son’s friends in school told my son and a teacher that his father was molesting him. Child protective services has opened an investigation and now they want to interview me because my son’s friend has often stayed overnight at our house. I don’t have any information that would be useful as the child has not disclosed anything unusual to me. I don’t want to be part of any investigation that could jeopardize my position with the UAE. I also don’t want to get in trouble for not cooperating in an investigation. Can I have a lawyer relay my position to child protective services on my behalf to keep me out of this?