function get_custom_terms($taxonomy)
{
    $args = array(
      'parent' => 0,
      'pad_counts' => true,
      'hide_empty' => false
  );

    $terms = get_terms($taxonomy, $args);

    if (count($terms) != 0) {

        foreach ($terms as $term) {

            $term = sanitize_term($term, $taxonomy);
            $term_link = get_term_link($term, $taxonomy);
            if (is_wp_error($term_link)) {
                continue;
            }

            $array[] = $term->name;

            $term_children = get_term_children($term->term_id, $taxonomy);

            if (count($term_children) != 0) {
                foreach ($term_children as $term_id) {

                    $term_child = get_term_by('id', $term_id, $taxonomy);

                    $term_child = sanitize_term($term_child, $taxonomy);
                    $term_child_link = get_term_link($term_child, $taxonomy);
                    if (is_wp_error($term_child_link)) {
                        continue;
                    }

                    $array[]['children'] = $term_children->name;
                }
            }
        }
        return $array;
    }
}