title: Wordpress - display categories with subcategories of specific parent category
body: <p>I want to display categories with nested subcategories of specific parent that I know the id of. I want to use wp_list_categories function. Here is my code:</p>
  
  <pre><code>            $args = array(
                 'taxonomy'     =&gt; 'product_cat',
                 'orderby'      =&gt; 'name',
                 'show_count'   =&gt; 0,
                 'hierarchical' =&gt; 1,
                 'title_li'     =&gt; '',
                 'hide_empty'   =&gt; 0,
                 'parent'     =&gt; 20
  
          );
              wp_list_categories($args);
  </code></pre>
  
  <p>Categories of parent with the id of 20 are displaying correctly, but their children(subcategories) are not showing. What can be the solution here?</p>