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To use Django admin inlines from a second model when the child of the first model has a OneToOne relationship with the second model, you can follow these steps:

1. Define the models and their relationships in your Django app.

class FirstModel(models.Model):
    # fields for FirstModel here

class SecondModel(models.Model):
    first_model = models.OneToOneField(FirstModel, on_delete=models.CASCADE)
    # fields for SecondModel here

1. Create an inline admin class for the SecondModel.

class SecondModelInline(admin.StackedInline):
    model = SecondModel

1. Create an admin class for the FirstModel and add the inline admin class.

class FirstModelAdmin(admin.ModelAdmin):
    inlines = [SecondModelInline]

admin.site.register(FirstModel, FirstModelAdmin)

Now you should be able to manage SecondModel objects inline in the admin interface for a FirstModel object.