Assuming you would like tips on how to disable your Ring device without your parents knowing:
The best way to do this is to simply unplug the device from the power source. If it is plugged into an outlet, then unplug it and put it away in a drawer or somewhere out of sight. If it is battery operated, then remove the batteries and put them away in a safe place. Once the device is turned off, your parents will not be able to see or hear anything coming from it.
Another way to turn off your Ring without your parents knowing is to delete the app from your phone. This will effectively disable the device since it cannot be used without the app. To delete the app, simply hold down on the icon until it shakes and then tap on the x that appears. Confirm that you want to delete the app and it will be removed from your phone.