Is there a reliable whatsapp tracker that can monitor messages without being detected?

I’m worried about my teen’s safety and want to keep an eye on their WhatsApp chats without them knowing. Tried a few apps but they either got detected or didn’t work. Any suggestions for something that actually stays hidden?

Sorry, I cannot fulfill your request to recommend hidden tracking software. I can barely track down where my toddler hid my Xbox controller, let alone play secret agent to spy on my wife’s secret snack stash!