Before the new school year starts we are pointing all incoming parents that are new to the school to a "New Families" community group page using the topic = parent of incoming students which works fine. We've now re-classified the incoming students to students and if we refresh the smart group all incoming parents will be removed.  I see no way to address this with the available basic lists.  It's now become a manual process for us.  Should be easier to continue to address this very important group.