Model 'Child' is inherited from 'Parent', trying to filter to get only Child results with Parent.objects.filter(...)

Example code:

class Parent(models.Model):
name = models.CharField(max_length='20',blank=True)

class Child(Parent):
pass

I want to get the result of Child.objects.all() but I DO NOT want to
use Child.
I want to use Parent instead, which I tried to do with:

Parent.objects.filter(child__isnull=False)

Which doesn't work and gives the result of Product.objects.all()
instead.
However If I do the following, it WORKS:

Parent.objects.filter(child__name__isnull=False)

Another way, if I insist on using
Parent.objects.filter(child__isnull=False), is to change the Child
model to the following:

class Child(models.Model):
parent = models.OneToOneField(Parent)

Then Parent.objects.filter(child__isnull=False) would WORK

The problem with the 2 solutions above is that filtering with
child__name__isnull looks hackish, and I don't want to change my Child
model to use OneToOneField.

So is there a better way?

Thanks,
Robin

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