Child Pages Listing by Role

/*
 * Get user's role
 */
if ( ! function_exists( 'sb_get_user_role' ) ) :
	function sb_get_user_role( $user = null ) {
		$user = $user ? new WP_User( $user ) : wp_get_current_user();
		return $user->roles ? $user->roles[0] : false;
	}
endif;


/**
 * Child Pages Listing for Intranet
 */
if ( ! function_exists( 'sb_intranet_subpage_navigation' ) ) :
	function sb_intranet_subpage_navigation() {

		global $post;

		if ( $post->post_parent ) :

			$children = wp_list_pages( array(
				'title_li' => '',
				'child_of' => $post->post_parent,
				'echo'     => 0,
				'depth' => 1
			) );
			$title = get_the_title( $post->post_parent );

		else :

			$children = wp_list_pages( array(
				'title_li' => '',
				'child_of' => $post->ID,
				'echo'     => 0,
				'depth' => 1
				) );
			$title = get_the_title( $post->ID );

		endif;

		if ( $children ) : ?>
		<aside id="secondary" class="widget-area" role="complementary">
			<section class="widget widget_categories">
				<h3 class="widget-title"><?php echo esc_attr( $title ); ?></h3>
				<ul>
					<?php 
						echo $children;
					?>
				</ul>
			</section>
		<aside>
		<?php endif;
	}
endif;