Your child pages will show up as usual provided you set them up correctly in the Menu settings page. Make sure the child page is indented to the right under the parent page in the Menu settings.

Let me know if you continue to have problems.

Thanks for stopping by, and I am glad you found the tutorial helpful.

query_posts(array(“post__not_in”=>array($do_not_duplicate)));

Please note its location near the end of the function.

With regards to displaying posts in columns, this is easily done. You can either use a table (old school) or divs (much nicer). Please note the update at the end of the post.

I have tried your code. It is working fine but posts are still duplicated.