Looking for Dirk de Graaf

Dirk de Graaf (now 74) migrated in the 60's to Australia as a 19 year old. But he lost contact with his family and no one heard from him again. Willemien and her partner Ben de Graaf, Dirk's brother will now come to Australia to try and find out more about him. Do do know or know of him? Please email [email protected]