gistfile1.php

  $query = new EntityFieldQuery();
  $query->entityCondition('entity_type', 'taxonomy_term')
    ->entityCondition('bundle', 'property_country_city')
    ->fieldCondition('name_field', 'value', $city, '=')
    ->range(0, 1)
    ->addTag('term_is_child_of')
    ->addMetaData('parent_term_id', $country_id)
    ->addMetaData('account', user_load(1)); // Run the query as user 1.
  $result = $query->execute();