I have a website. There the following structure:

Parent Category:
Child category 1
Child category 2

In Parent Category I need display all posts of child category.

I write next WP query:

    $child_pages = new WP_Query(array(
        'post_type' => 'post',
        'category__in' => 5,
        'posts_per_page' => 3,
        'order' => 'ASC',
        'orderby' => 'title',

For the argument 'category__in' I set Parent category ID (its Parent category ID). But it is not working. In parent category posts not displayed.

How i get all child category posts on parent category?

Guys, and sorry for my English. Im in learning.. Yes, I'm ashamed))

1 Answer 1


You need to use a tax_query with WP_Query. With a tax_query, by default, child terms are included to the term being set. Here is the example-

$args = array(
      'post_type'      => 'post', // Your post type
      'orderby'        => 'meta_value_num', 
      'meta_key'       => 'rankk', 
      'order'          => 'DESC', 
      'posts_per_page' => 100,
      'tax_query' => array(
                'taxonomy'         => 'category', // Taxonomy name
                'field'            => 'term_id', // Means you'll use term id to determine your parent term.
                'include_children' => true,
                'operator'         => 'IN'
                'terms'            => 'YOUR PARENT CATEGORY ID', // Your term or category ID

$q = new WP_Query( $args );

if ( $q->have_posts() ) {
    while ( $q->have_posts() ) {

Hope this above helps.

  • Thank you sir for answer! And in the field 'term_id' I should set child categories ID? I mean argument 'field' => 'term_id'. Can I get all child categories posts? Sep 5, 2018 at 8:03
  • @AlexGromov Please see my updated answer, I made it clear. And if this helps you then please accept the answer by clicking the check sign or tick mark at the left of my answer.
    – CodeMascot
    Sep 5, 2018 at 8:11
  • Please, sir, let me one question. We have field: 'terms' => 'YOUR PARENT CATEGORY ID', How correctly I should set Parent category ID? Just write ID number? Sep 5, 2018 at 8:17
  • Yes. Write the ID number as a string or as far I can remember, you can pass an array too. Like either 'terms' => '23', or 'terms' => 23, or 'terms' => array( 23 ),. As you like. But remember here 23 is just a place holder, use your term ID.
    – CodeMascot
    Sep 5, 2018 at 8:20
  • Thank you, sir! Thank you my American friend! Hello from Russia. Your code is working and help me. Sep 5, 2018 at 9:23

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