<?php $stati_children = new WP_Query(array(
'post_type' => 'page',
'post_parent' => get_the_ID()
)); ?>
<?php if($stati_children->have_posts()) : ?>
<?php while($stati_children->have_posts()): $stati_children->the_post(); ?>
<a class="cat--inner" href="<?php the_permalink(); ?>">
<div class="miniature"><?php the_post_thumbnail('medium_large'); ?></div>
<div class="title-block"><?php the_title(); ?></div>
</a>
<?php endwhile; ?>
<?php endif; ?>
<?php wp_reset_query(); ?>