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To establish a connection between three Django models, you would need to follow these steps:

1. Define the models: Define the three models in your Django project with the specific fields and characteristics that you need.

2. Create relationships: Create relationships between the three models. There are three types of relationships that you can create in Django: one-to-many, many-to-one, and many-to-many.

3. Use foreign keys: Use foreign keys to create one-to-many and many-to-one relationships. A foreign key is a field in one model that refers to the primary key in another model.

4. Use through models: Use through models to create many-to-many relationships. A through model is a model that connects two other models to create a many-to-many relationship.

5. Use related names: Use related names to make it easier to access related objects. A related name is a name that you can use to refer to the related objects from a model.

6. Test the connection: Test the connection between the three models by creating instances of each model and connecting them together. Check that the relationships and related names are working correctly.