title: WordPress child theme files in subdirectory not overriding
body: <p>I am modifying a WordPress theme using a child theme. In my child theme folder, I have created a folder called "includes" (just like the parent) and have made edits to the content-post.php, content-single.php and content-single-portfolio.php files. I have added to the functions.php file in the child folder:</p>
  
  <pre><code>require_once( get_stylesheet_directory() . 'includes/content-post.php' );
  require_once( get_stylesheet_directory() . 'includes/content-single.php' );
  require_once( get_stylesheet_directory() . 'includes/content-single-portfolio.php' );
  </code></pre>
  
  <p>This causes a 500 internal error and I'm not sure why.</p>
  
  <p>Reference:
  <a href="http://codex.wordpress.org/Child_Themes" rel="nofollow noreferrer">http://codex.wordpress.org/Child_Themes</a></p>
  
  <p><a href="http://systemspecialist.net/2013/04/16/add-customized-files-includes-folder-to-wordpress-child-theme/" rel="nofollow noreferrer">http://systemspecialist.net/2013/04/16/add-customized-files-includes-folder-to-wordpress-child-theme/</a></p>
  
  <p>I also tried this solution and get the same 500 error: 
  <a href="https://stackoverflow.com/questions/24128283/wordpress-child-theme-including-includes-files">WordPress Child Theme including includes files</a></p>