$current = $post->ID;
$parent = $post->post_parent;
$args = array(
'post_type'=>'page',
'orderby'=>'menu_order',
'order'=>'ASC',
'post_parent'=>$parent
);
$siblings = new WP_Query($args);
if($siblings->have_posts()){
?>
} wp_reset_query();?>
the_title();?>
the_content();?>