Got it!
This is my solution:
content-children.php
<?php
/**
* @since XXXXX
*/
?>
<?php
$args = array(
'post_type' => 'page',
'posts_per_page' => -1,
'post_parent' => $post->ID,
'order' => 'ASC',
'orderby' => 'menu_order'
);
$parent = new WP_Query( $args );
if ( $parent->have_posts() ) : ?>
<?php while ( $parent->have_posts() ) : $parent->the_post(); ?>
<article id="post-<?php the_ID(); ?>" <?php post_class($column); ?>>
<header class="entry-header">
<h4 class="entry-title"><?php the_title(); ?></h4>
</header><!-- .entry-header -->
<?php
global $more;
$more = 0;
?>
<div class="front-page entry-content" id="<?php echo $page->post_name; ?>">
<?php the_content('<p style="text-align:right">> read more</p>'); ?></p>
</div>
</article>
<?php endwhile; ?>
<?php endif; wp_reset_query(); ?>
