What is the test for denying suppression of evidence in a civil case where a minor was prevented from seeing his mother by the police?

Defendant acknowledges that the police did not engage in deception or trickery to isolate him from his mother or the other adults who attempted to see him. Defendant's sister was told his whereabouts, and his mother was prevented from seeing him when she first arrived at the station house only because the police reasonably believed that they were dealing with an adult and, therefore, were lawfully questioning him alone. We conclude that appellant's argument in this regard provides no basis for disturbing the lower courts' denial of suppression on the legal theory or on the undisturbed supportable evidentiary record (see, People v. Winchell, 64 N.Y.2d 826, 827, 486 N.Y.S.2d 930, 476 N.E.2d 329).