Liquid: Siteleaf Related Posts

gistfile1.liquid

<ul>
{% for related_post in parent.posts %}
  {% for tag in current.taxonomy['tags'].values %}
    {% if related_post.taxonomy['tags'][tag.slug] and related_post.id != current.id %}
      <li><a href="{{related_post.url}}">{{related_post.title}}</a></li>
      {% break %}
    {% endif %}
  {% endfor %}
  {% if forloop.index == 3 %}{% break %}{% endif %}
{% endfor %}
</ul>