Selectively hit the update signal for a model

Question

I have a model called as nodes:

class node(models.Model):
    name = models.CharField(max_length=200)
    status = models.CharField(
       max_length=32,
       choices=[],  # some list of choices
   )
    created_on = models.DateTimeField(auto_now_add=True)
    id = models.UUIDField(default=uuid.uuid4, editable=False, unique=True, primary_key=True)

    def __str__(self):
        return self.name

A node has a status. There can be nodes which are dependent on the status of a particular node. For example: node B,C is dependent on node A. Node D is dependent on node B.

I have a post_save signal which is triggered when the status of a particular node is changed.

What I want: When I change the status of A, the status of B and C should also change accordingly. And since node D is dependent on node B, the status of D also should change as per the node B's new status.

Problem: The post_save signal hits everytime the change of any of these nodes is changed. So for example, an update signal will be fired when status of A is changes. I would then want to change the status of B and C in this trigger. But as soon as the status of B changes, the post_Save signal will again be hit and the code would not even reach to changing the status of C. How can I make sure that the status of all the dependent nodes are changed in right sequence and manner?