How to sort posts alphabetically based on a specific parent category

You can use the following code snippet to sort posts alphabetically based on a specific parent category in WordPress:

<?php 
$parent_cat="Parent Category Name"; 
$parent_cat_id = get_cat_ID($parent_cat); 
$args = array(
 'category__in' => array($parent_cat_id),
 'orderby' => 'title', 
 'order' => 'ASC', 
 'posts_per_page' => -1
);
$query = new WP_Query( $args );
if ( $query->have_posts() ) {
 while ( $query->have_posts() ) {
   $query->the_post();
   the_title();
   echo '<br>';
 }
 wp_reset_postdata();
} else {
 // no posts found
}
?>

In the code, replace “Parent Category Name” with the actual name of the parent category you want to sort posts from. The code will retrieve all the posts under this category, sort them alphabetically based on the post title, and display the title of each post.