Conditional tag isn't working

Latest version of WordPress on sidebar.php of a custom theme with no widgets enabled.

Everything on the sidebar works everywhere on the site except for the bit meant for the homepage. It doesn’t show at all.

Any ideas would be great 🙂

<div id="sidebar">

<h4>Subscribe</h4>
<ul>
<li><a href="http://domain.com">RSS Feed</a></li>
</ul>

<?php if (is_home() || is_front_page()) { ?>
<h4>Home</h4>
<ul>
<li><a href="http://domain.com">My Link</a></li>
</ul>
<?php } ?>

<?php if (is_page(array('6'))) { ?>
<h4>Navigation</h4>
<ul>
<li <?php if (is_home()){echo 'class="current_page_item"';}?>><a href="<?php bloginfo('url'); ?>/">Home</a></li>
<?php wp_list_pages('title_li=&depth=1&exclude=143,2,87,148,149'); ?>
</ul>
<?php } ?>

<?php
  if($post->post_parent) {
  $children = wp_list_pages("title_li=&child_of=".$post->post_parent."&echo=0");
  $titlenamer = get_the_title($post->post_parent);
  }
  else {
  $children = wp_list_pages("title_li=&child_of=".$post->ID."&echo=0");
  $titlenamer = get_the_title($post->ID);
  }
  if ($children) { ?>
  <h4><? echo $titlenamer ?></h4>
  <ul>
  <?php echo $children; ?>
  </ul>
<?php } ?>

<h4>Latest Updates</h4>
<ul>
<?php query_posts(array('tag__not_in' => array(5), 'showposts' => 3)); if ( have_posts() ) : while (have_posts()) : the_post(); ?>
<li><a href="<?php the_permalink() ?>" title="<?php the_title_attribute(); ?>"><?php the_title(); ?></a></li>
<?php endwhile; endif; ?>
</ul>

<h4>Connect</h4>
<ul>
<?php wp_list_bookmarks('title_li=&category=2&categorize=0'); ?>
</ul>

<div id="paypalside">
<p>paypal form here</p>
</div>

</div>