/**
  * @param  Marriage $marriage 
  * @return boolean|Marriage Marriage used as boolean. If it matches the conditions.      
  */
 public function isSatisfiedBy($marriage)
 {
     $marriages = $marriage->getMarriages();
     foreach ($marriages as $marriageEvent) {
         // if both of these are not true (it is before the start OR after the end)
         if ($marriageEvent->occurredOn < $start || $mariageEvent->occurredOn > $end) {
             return false;
         }
     }
     return $marriage;
 }