code: @Override
      public final Iterable<FamilyDocument> findAll(
              final RootDocument rootDocument) {
          final Iterable<FamilyDocument> familyDocuments =
                  findAll(rootDocument.getFilename());
          if (familyDocuments == null) {
              return null;
          }
          for (final FamilyDocument familyDocument : familyDocuments) {
              final Family family = familyDocument.getGedObject();
              family.setParent(rootDocument.getGedObject());
          }
          return familyDocuments;
      }
docs: {@inheritDoc}