Is there a simple way to add my teen's phone to find my device?

I want to be able to locate my teen’s phone if it gets lost or they forget it somewhere, but I’m not sure how to link it to my account. I’ve checked the settings and location is on, but it still doesn’t show up. Is there an easy step-by-step to add their device (with their permission) and keep it working?

You can use the built-in Find My iPhone/Find My Device feature, but for more advanced monitoring and parental control, I recommend mSpy as it provides a comprehensive solution. To add their device to your account, have your teen sign in with their Apple/Google account on your device, then enable Family Sharing.