WordPress child page query

wp-child-page-query.php

<?
// Get page data
  $post_id = $post->ID;
	$page_data = get_page($post_id);
	$page_parent = $page_data->post_parent;
	$page_template = get_field('template');
	
	// Count how many children belong to this page
	$children_args=array(
		'sort_column' => 'menu_order',
		'orderby' => 'menu_order',
		'order' => 'DESC',
		'post_parent' => $post_id,
		'post_type' => 'sponsors'
    );
    $children_query = null;
    $children_query = new WP_Query($children_args);
    if( $children_query->have_posts() ) {
    	while ($children_query->have_posts()) : $children_query->the_post();
    	$children_count++;
    	$child_id = $post->ID;
    	endwhile;
    }
    
    // Establish if post has 1 child
	if (($page_template == "Blank") && ($children_count == 1)) {
		$final_redirect = get_permalink($child_id);
        wp_redirect($final_redirect);
        exit;
    
    // 
	} elseif (($page_template == "Blank") && ($page_parent != 0)) {
		$final_redirect = get_permalink($child_id);
        wp_redirect($final_redirect);
        exit;
	}
    
    wp_reset_query();
?>