It's on the underside of his ballsack. You can only see it from the back, and then only if it's a warm day.Good one.
JFK jr never had a tattoo. There's hundreds of photos of him shirtless and none show a tattoo other then the pics posted in your link.
You fall for fake shit so easily.
https://www.google.com/search?q=jfk...mAhWMLs0KHQKPDxMQsAR6BAgLEAE&biw=1280&bih=606