With Locate a device in Find My.
Your devices are at the top of the list, and your family members’ devices are below yours.
If you receive a notification in the Find My app that says AirTag Detected Near You or Unknown AirTag, you can ask the family member who owns it to share the AirTag with you.
In the notification, tap Ask Owner to Share AirTag.
Tap Ask Owner at the bottom of the screen.
You can also use Locate a device in Find Devices on iCloud.com in the iCloud User Guide.