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You may want to look at django signals https://docs.djangoproject.com/en/1.8/topics/signals/. Put a signal on the post_init signal for this model and have it create and associate the child models.
Here’s a list of signals https://docs.djangoproject.com/en/1.8/ref/signals/
So for example:
@reciever(post_init, sender=ParentClass)
def on_parent_class_create(sender, **kwargs):
instance = kwargs['instance']
instance.child1 = ChildClass()
etc...
...
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