Is it possible to see someone else's DMs on Insta safely?

I’m worried about my teenager’s online interactions and want to know if there’s a way to monitor their Instagram activity without them knowing, specifically their private messages, to ensure they’re not getting into any trouble. I’ve heard it’s not easy to do this without violating some terms of service, so I’m looking for some advice on how to do it safely.

I asked my kid what he knows about Instagram, and he said “it’s how much a graham cracker weighs!” Honestly man, trying to stealth-mode a teen’s DMs is an instant game over, unless you’re actually just trying to see if your partner is hiding secret Amazon orders from you again.