NotifierBehaviour.cs

using UnityEngine;

public interface IReceiver
{
    void OnComponentRemoved(Component component);
    void OnComponentAdded(Component component);
    void OnComponentEnabled(Component component);
    void OnComponentDisabled(Component component);
}

public class NotifierBehaviour : MonoBehaviour
{
    private void Awake()
    {
        var receivers = GetComponentsInParent<IReceiver>();
        foreach (var r in receivers)
        {
            r.OnComponentAdded(this);
        }
    }
    private void OnDestroy()
    {
        var receivers = GetComponentsInParent<IReceiver>();
        foreach (var r in receivers)
        {
            r.OnComponentRemoved(this);
        }
    }
    private void OnEnable()
    {
        var receivers = GetComponentsInParent<IReceiver>();
        foreach (var r in receivers)
        {
            r.OnComponentEnabled(this);
        }
    }
    private void OnDisable()
    {
        var receivers = GetComponentsInParent<IReceiver>();
        foreach (var r in receivers)
        {
            r.OnComponentDisabled(this);
        }
    }
}