Can a court order disclosure of confidential information in a custody case where the best interest of the child is the guiding principle?

It is noteworthy, that in custody cases, where the best interest of the child is similarly the guiding principle, courts have found that a statutory privilege of confidentiality must give way to protect the best interests of the child, upon a proper showing that disclosure of the privileged matter is "necessary and material" to a resolution of the issue before the court. As stated by the court in Perry v. Fiumano, 61 A.D.2d 512, 519, 403 N.Y.S.2d 382, 386 (4th Dept., 1978):