Transform.IsChildOf

Description

Является ли данный transform потомком указанного родителя parent?

Returns a boolean value that indicates whether the transform is a child of a given transform. true if this transform is a child, deep child (child of a child) or identical to this transform, otherwise false.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    void OnTriggerEnter(Collider col) {
        if (col.transform.IsChildOf(transform))
            return;
        
        print("Do something here");
    }
}