UMSRA has temporarily decided to stop tracking the family trees of mythological entities. You have been asked to make the fathermother and spouse fields readonly.
You can do this by:
@admin.register(Hero)
class HeroAdmin(admin.ModelAdmin, ExportCsvMixin):
    ...
    readonly_fields = ["father", "mother", "spouse"]
Your create form looks like this:
_images/changeview_readonly.png