What can the au pair do for the family? What roles can she/he play in assisting my children and family?

warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'mimemail_incoming_access' not found or invalid function name in /usr/www/users/aupairh/devsite/includes/menu.inc on line 452.

No set rules but there are the norms and what an au pair is prepared to do as opposed to the role that a domestic plays. The au pair takes the place of the parent/s whilst they are not there.