Hi Frozen11,
Thank you for participating in the Apple Support Communities. We understand your older son's device is still associated with his Apple ID when you tap on Family. You'll want to make sure you've removed it from his Apple ID device list. This article explains how: Check your Apple ID device list to find where you're signed in.
"If you set up two-factor authentication for your Apple ID, removing a device will ensure that it can no longer display verification codes. It also won't have access to iCloud and other Apple services, including Find My, until you sign in again with two-factor authentication. The device won't reappear in the list unless you sign in again.
You can also permanently remove a device from your account page
Use your iPhone or iPad to remove a device
- Tap the device to find its details, then tap Remove from Account.
- Review the message that appears, then tap again to confirm that you want to remove the device.
Use your Mac to remove a device
- Choose Apple menu > System Settings. In macOS Monterey or earlier, choose Apple menu > System Preferences.
- Click your name. In macOS Monterey or earlier, click Apple ID.
- Click the device to find its details, then click Remove from Account.
- Review the message that appears, then click again to confirm that you want to remove the device.
Use your PC to remove a device
- Open iCloud for Windows.
- Click Account Details, then click Manage Apple ID.
- Click the device to find its details, then click Remove from Account.
- Review the message that appears, then click again to confirm that you want to remove the device.
Use the web to remove a device
- Sign in to appleid.apple.com, then select Devices.
- Select the device to find its details, then select "Remove from account."
- Review the message that appears.
- Click again to confirm that you want to remove the device.
Permanently remove a device from your account page
If you're still signed in with your Apple ID on the device, it might reappear on your account page the next time your device connects to the Internet. To permanently remove the device from your account page, sign out of iCloud, iTunes & App Stores, iMessage, FaceTime, and Game Center on that device, or erase that device."
Take care.
