[Answered ]-Django 1.7.1: Child model, remove all references to parent model and make child model inherit from grandpa instead

Not sure if there’s an easier way to do this but….

Try creating a C’ that inherits A.
Then create a program that creates a C’ instance of each C instance.
(Delete all instance of C afterwards)

If you want to keep the name C, update schema for C and then repopulate C from the C’ instances.

Hope it helps. 🙂