WordPress Codex about query_post()

Note: This function isn’t meant to be used by plugins or themes. As explained later, there are better, more performant options to alter the main query. Double Note: query_posts() is overly simplistic and problematic way to modify main query of a page by replacing it with new instance of the query. It is inefficient (re-runs SQL queries) and will outright fail in some circumstances (especially often when dealing with posts pagination). Any modern WP code should use more reliable methods, like making use of pre_get_posts hook, for this purpose. TL;DR don’t use query_posts() ever;

Post to post relationships