How can I track my son's iPhone location from mine?

To find family members in Find My, on your iPhone, go to Find My > People. If your family member’s location is not showing up, they may not be sharing location with you, in which case you would need to set up Find My with Family Sharing.

Learn more ⇢ Share your location with your family - Apple Support

Still need help?

• Contact - Find My - Official Apple Support
• US, call - 1 (800) APL-CARE
• International - Find your region’s support number

-Zachyy

Your son can share his location with you:

Find people and share your location with Find My - Apple Support