sidebar.php

<aside id="sidebar" class="col-xs-12 col-sm-4" role="complementary">
	<div class="sidebar-header">
		<h2>
			<?php
			// This gets home and parent page IDs
			$parent_id = $post->post_parent;
			$home_id = get_option('page_on_front');
			// This gets the link to the parent page, based on the parent page ID
			$parent_page_id = ($parent_id == 0 ? get_option('page_on_front') : $parent_id);
			$redirectHeading = get_post_meta( $parent_page_id, 'redirectUrl', true );
			if ( $redirectHeading ) { ?>
				<a href="<?php echo $redirectHeading; ?>">
			<?php } else { ?>
				<a href="<?php echo make_path_relative( get_permalink($parent_page_id) ); ?>">
			<?php } ?>
				Also in <?php echo get_the_title($parent_page_id);?>
			</a>
		</h2>
	</div>
	<div class="sidebar-nav clearfix">
		<ul class="sibling">
			<?php
			$args = array(
				'child_of' => $parent_id,
				'parent' => $parent_id,
				'hierarchical' => 0,
				'sort_column' => 'menu_order',
				'exclude' => array( $post->ID, $home_id ),
				'post_type' => 'page',
				'post_status' => 'publish'
			);
			$pages = get_pages( $args );
			foreach ( $pages as $page ) {
			    $redirect = get_post_meta( $page->ID, 'redirectUrl', true );
				if ( $redirect ) { ?>
					<li>
						<a href="<?php echo $redirect; ?>" title="<?php echo $page->post_title ?>">
							<?php echo $page->post_title; ?>
						</a>
					</li>
				<?php } else { ?>
					<li>
						<a href="<?php echo make_path_relative( get_page_link( $page->ID ) ); ?>" title="<?php echo $page->post_title ?>">
							<?php echo $page->post_title; ?>
						</a>
					</li>
				<?php }
			} ?>
		</ul>
	</div>
</aside>