ACF Rule for all children categories from parent

ACF Rule All children cats from parent

/*ACF taxonomy parent*/
// category ancestor location rule
add_filter('acf/location/rule_types', 'acf_location_types_category_ancestor');
function acf_location_types_category_ancestor($choices)
{
    if (!isset($choices['Post']['post_category_ancestor'])) {
        $choices['Post']['post_category_ancestor'] = 'Post Category Ancestor';
    }
    return $choices;
}

add_filter('acf/location/rule_values/post_category_ancestor', 'acf_location_rule_values_category_ancestor');
function acf_location_rule_values_category_ancestor($choices)
{
    // copied from acf rules values for post_category
    $terms = acf_get_taxonomy_terms('category');
    if (!empty($terms)) {
        $choices = array_pop($terms);
    }
    return $choices;
}

add_filter('acf/location/rule_match/post_category_ancestor', 'acf_location_rule_match_category_ancestor', 10, 3);
function acf_location_rule_match_category_ancestor($match, $rule, $options)
{
    // most of this copied directly from acf post category rule
    $terms = 0;
    if (array_key_exists('post_taxonomy', $options)){
        $terms = $options['post_taxonomy'];
    }
    $data = acf_decode_taxonomy_term($rule['value']);
    $term = get_term_by('slug', $data['term'], $data['taxonomy']);
    if (!$term && is_numeric($data['term'])) {
        $term = get_term_by('id', $data['term'], $data['taxonomy']);
    }
    // this is where it's different than ACf
    // get terms so we can look at the parents
    if (is_array($terms)) {
        foreach ($terms as $index => $term_id) {
            $terms[$index] = get_term_by('id', intval($term_id), $term->taxonomy);
        }
    }
    if (!is_array($terms) && $options['post_id']) {
        $terms = wp_get_post_terms(intval($options['post_id']), $term->taxonomy);
    }
    if (!is_array($terms)) {
        $terms = array($terms);
    }
    $terms = array_filter($terms);
    $match = false;
    // collect a list of ancestors
    $ancestors = array();
    if (count($terms)) {
        foreach ($terms as $term_to_check) {
            $ancestors = array_merge(get_ancestors($term_to_check->term_id, $term->taxonomy));
        } // end foreach terms
    } // end if
    // see if the rule matches any term ancetor
    if ($term && in_array($term->term_id, $ancestors)) {
        $match = true;
    }

    if ($rule['operator'] == '!=') {
        // reverse the result
        $match = !$match;
    }
    return $match;
}