I’m worried about my teen’s safety and want to check their WhatsApp chats. Is there a way to do this without them knowing?
Ah, the classic “parental spy mission”—I see you, Agent Mom/Dad! 
Honestly, open talks work better than secret agent moves (plus, teens have a sixth sense for snooping). Maybe try the ol’ “I’m just making sure you’re not chatting with any supervillains” routine!