How to display the elements to which the ManyToManyField field is bound?

Question

Django

There is an article with the field parents = models.ManyToManyField(Category), where Category is the category class to which the article belongs.
When outputting, {{ page.parents.name }} outputs app_name.Category.None (app_name is the application name).
How to get them out?
PS If there is not enough information - say what else to provide.