How do I show navbar items based on a model field in Django?

I have a Blog model that looks like this:

class Blog(models.Model):

    title = models.CharField(max_length=200)
    content = models.TextField()
    slug = models.SlugField(max_length=200, unique=True)
    author = models.ForeignKey(User, on_delete=models.CASCADE, related_name='blogs')
    parent = models.CharField(max_length=50, choices=PARENT_TUTORIALS)

    def get_absolute_url(self):
        return reverse("blog_list", args=[str(self.parent), str(self.slug)])

I can succesfully display all the blogs on a table of contents via my table.html template:

However, I want to show only those blogs that have the same Blog.parent value as the current blog page. For example, the page example.com/biology/page1, has biology as a parent. When the user is on that page, the table of contents should show only the pages that have biology as a parent.