Thank you for contacting us and I'll be happy to assist.
Can you please update your code as follows and see if it works:
$query_by_element = get_the_ID(); // ID of post to get relationship from
$relationship = 'traduction'; // relationship slug
$query_by_role_name = 'intermediary'; // $query_by_element is a intermediary in this relation
$limit = 100; // defaults
$offset = 0; // defaults
$args = array(); //nothing needed
$return = 'post_id'; // We want Post ID
$role_name_to_return = 'parent'; // We want parent. Change it to 'child' to get child relative
$get_results = toolset_get_related_posts(
$query_by_element,
$relationship,
$query_by_role_name,
$limit,
$offset,
$args,
$return,
$role_name_to_return
);
print_r($get_results);
Feel free to adjust the values as need and make sure that relationship slug is "traduction".
I hope this helps and please let me know how it goes.