code: @Override
      public void visit(final FamS fams) {
          final FamilyNavigator navigator = new FamilyNavigator(fams);
          final Family family = navigator.getFamily();
          if (family.isSet()) {
              familySNavigators.add(navigator);
          }
      }
docs: Visit a FamS. We will build up a collection of Navigators to the FamSs.
  
  @see GedObjectVisitor#visit(FamS)