Restrict Wordpress pages a specific page ID and also apply the parent or grand parent template

Restrict-Sub-Pages.php

function wpex_restrict_page_to_logged_in_user() {

	// Get global post
	global $post;

	// Prevent access to page with ID of x and all children of this page
	$page_id = 5631;
	$parent = $post->post_parent;
	$get_grandparent = get_post($parent);
	$grandparent = $get_grandparent->post_parent;

	if ( is_page() && ( $parent == $page_id || $grandparent == $page_id  ) ) {

		// Set redirect to true by default
		$redirect = true;

		//echo 'sub rentry page-';

		// If logged in do nor redirect
		// You can/should place additional checks here based on user roles or user meta
		if ( is_user_logged_in() ) {
			//echo 'logged in -- dont redirect me';
			$redirect = false;
			
		}

		
		// Redirect people witout access
		if ( $redirect ) {
			wp_redirect(  get_permalink( $page_id ) );
			//echo 'redirect me';
		}

		//apply the same page template to all sub-pages

		
		

		if($grandparent){
			$parent_page_template = get_post_meta($grandparent,'_wp_page_template',true);
		}else{
			if(!is_page($page_id)){
				$parent_page_template = get_post_meta($parent,'_wp_page_template',true);
			}
		}


			//echo 'parent page template = ' . $parent_page_template;
 
			$template = TEMPLATEPATH . "/{$parent_page_template}";
			if (file_exists($template)) {
				load_template($template);
				exit;
			}



	}

}


add_action( 'template_redirect', 'wpex_restrict_page_to_logged_in_user' );