Pulling excerpts from child pages on parent?

I have enabled custom excerpts on my pages with this function.

add_action('init', 'page_excerpts');

function page_excerpts() {
    add_post_type_support( 'page', 'excerpt' );
}

However, When I enter a data into the excerpt field I still have the content returning in the loop instead of the excerpt.

<?php the_excerpt(); ?>

What am I doing wrong here?
Do I need to do anything else to force the content to be pulled from the excerpt field on pages?

Here is my full code

<?php
$child_pages = $wpdb->get_results("SELECT *  FROM $wpdb->posts WHERE post_parent = ".$post->ID."   AND post_type = 'page' ORDER BY menu_order", 'OBJECT'); ?>
      <?php if ( $child_pages ) : foreach ( $child_pages as $pageChild ) : setup_postdata( $pageChild ); ?>
      <div class="grid_4">
        <h2><a href="<?php echo  get_permalink($pageChild->ID); ?>" rel="bookmark" title="<?php echo $pageChild->post_title; ?>"><?php echo $pageChild->post_title; ?></a></h2>
        <a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>">
		 <?php echo get_the_post_thumbnail($pageChild->ID, 'landing-page', array('title' => $pageChild->post_title ,'class' => 'post-image')); ?>
    	</a>
        <?php echo get_the_excerpt( $pageChild->ID ); ?>
        <p class="seemore"><a href="<?php echo  get_permalink($pageChild->ID); ?>" rel="bookmark" title="<?php echo $pageChild->post_title; ?>">See More</a></p>
      </div>
      <?php endforeach; endif; ?>

Cliffnotes

• the_excerpt(); is returning the_content() of child pages
• Not sure how to fix this