code: public void selectParentFrame() {
          String action = "Switching to parent frame";
          String expected = "Parent frame is selected";
          try {
              driver.switchTo().parentFrame();
          } catch (Exception e) {
              reporter.fail(action, expected, "Parent frame was not selected. " + e.getMessage());
              log.warn(e);
              return;
          }
          reporter.pass(action, expected, expected);
      }
docs: Select the parent frame. Used for returning to the next frame up after
  selecting a frame. If there are nested frames, the main content won't be
  selected, however the next frame in the parent child relationship will be