code: static final boolean isValidSketchID(final int id) {
      return (id == Family.ALPHA.getID())
          || (id == Family.QUICKSELECT.getID())
          || (id == Family.COMPACT.getID());
    }
docs: Returns true if given Family id is one of the theta sketches
  @param id the given Family id
  @return true if given Family id is one of the theta sketches