parent_user_unread comment
$meta_query = array( 'relation' => 'AND', array( 'key' => 'parent_user_id', 'value' => '1', 'compare' => '=', 'type' => 'NUMERIC', ), array( 'key' => 'parent_user_read', 'compare' => '=', 'type' => 'NUMERIC', ), );
$meta_query = array( 'relation' => 'AND', array( 'key' => 'parent_user_id', 'value' => '1', 'compare' => '=', 'type' => 'NUMERIC', ), array( 'key' => 'parent_user_read', 'compare' => '=', 'type' => 'NUMERIC', ), );