Content Type Hierarchy

I'm fairly new to Drupal have content types that loop in children content types using fields. The result is something like this.

Office Content Type
Field: Office Content Type
- Office Content Type
- Field: Person Content Type
- Field: Person Content Type
- Field: Person Content Type
- Office Content Type
-- Field: Office Content Type
-- Field: Person Content Type
-- Field: Person Content Type

I need a content type to be able to recognize it has a parent or grandparent. However this directory was created using content types for the offices instead of taxonomies. Is it possible to pull hierarchical information from nested content types? Should the Office Content Type have been created as a taxonomy instead?

Links to details and documentation is welcome.

I'm using Drupal 9.3.x

I came to a solution using a preprocess function. A key/value pair is added to the parent node. Named "headline_level" it is later referenced by the child and +1 is added. That number is assigned to a twig variable as the headline's number, "headline_level" is increased by 1 for the child if itself has children.

In this image we see a parent "office" pulling in child nodes as fields.

Level Diagram

Parent (h1)
|_ Child (h2) (see image)
   |_ Grandchild (h3)
      |_ Great GrandChild (h4)

Preprocess Function for theme

function THEME_preprocess_HOOK(&$variables) {
  $node = $variables['node'];

    /**
     * Parent Headline Level 
     * Displays logical headline structure
     * Applies higher value to 'headline_level' for subordinate content types; used in '/templates/node--HOOK.html.twig'
     */
    if ($node->_referringItem) {
      // Variables
      $counter = 1; // start level at 1
      
      // Append 'headline_level' to HOOK node
      $node->headline_level = $counter;
      $parentHeadline = $node->_referringItem->getEntity()->headline_level;
      
      // Check node for $parentHeadline else $counter, set twig variable
      if (isset($parentHeadline)) {
        // Increase 'headline_level' by 1
        ++$parentHeadline; // add 1
        $node->headline_level = $parentHeadline;
        $variables['office_headline_level'] = $parentHeadline; 
      } else {
        $variables['headline_level'] = $counter;
      }
    }

Twig Template for Content Type

  <div>
    <h{{ headline_level ?: 2 }}>{{ label }}</h{{ headline_level ?: 2 }}>
    {{ content.field_people }}
  </div>

As mentioned in the comments, these Offices should have been a Taxonomy. However, they were created as content types and referenced by fields.