I know that they not are not really siblings , but it's a cute photo of the them: Mathilde and Claire
http://img495.imageshack.us/my.php?i...eview261gn.jpg
Philip ( under his sister) , Astrid and Laurent
http://www.theroyalforums.com/forums...4&d=1063725155
Mathilde in a amused conversation with Laurent and Claire
http://www.theroyalforums.com/forums...2&d=1060004336