code: static void checkFamilyID(final int familyID) {
      final Family family = Family.idToFamily(familyID);
      if (!family.equals(Family.QUANTILES)) {
        throw new SketchesArgumentException(
            "Possible corruption: Invalid Family: " + family.toString());
      }
    }
docs: Checks the validity of the given family ID
  @param familyID the given family ID