get_posts() sort by parent/child relationship

Hello!

I’ve been tasked to create a “print all” page-template for WordPress. Displaying the title, 2 custom properties, and the entire content of every page in the WordPress install.

In order to accomplish this, i’ve used get_posts(), but it seems be lacking when trying to sort the output.

The desired output (as seen in admin):
Subpage 1
– Subpage 1.1
— Subpage 1.1.1
– Subpage 1.2
Subpage 2
– Subpage 2.1
– Subpage 2.2

The output get_posts() gives me:
Subpage 1
– Subpage 1.1
– Subpage 1.2
Subpage 2
– Subpage 2.1
— Subpage 1.1.1
– Subpage 2.2

The code:

$args = array(
'posts_per_page' => -1,
'orderby' => 'menu_order',
'exclude' => array(2, 70, 76),
'post_type' => 'page',
'post_status' => 'publish'
);
$listallprint = get_posts($args);

foreach ($listallprint as $page_item) : setup_postdata($page_item);
	$kontor = get_post_meta($page_item->ID, 'kontor', true);
	$projektleder = get_post_meta($page_item->ID, 'projektleder', true);
?>
<div class="list-page">
	<?php
	if($page_item->post_parent != 0) {
		echo '<h2 class="title">' . get_the_title($page_item->ID) . '</h2>';
	}
	else {
		echo '<h1 class="title">' . get_the_title($page_item->ID) . '</h1>';
	}

	if($kontor != '' || $projektleder != '') {
		echo '<p class="projektspec">';
			echo $kontor . '<br />';
			echo $projektleder;
		echo '</p>';
	}
	?>
	<p>
		<?php the_content(); ?>
	</p>
</div><!-- /.list-page -->
<?php endforeach; ?>

The question:
How do i sort the array properly, to display each related child-node beneath its parent? I’ve tried orderby => ‘menu_order parent’ and ‘parent’ also, to no avail.

Any help or direction is much appreciated, thanks.

// Thomas G