Apple Watch SE for my child under Family Plan

Good afternoon EngineerMama27

In the resource we sent above, are you able to follow the steps in the section entitled "Get apps with the iPhone that's paired with the Apple Watch" ? If you choose your son's Apple Watch, if an app you download to your iPhone has a compatible Apple Watch version, it should be able to install on your son's Apple Watch.

Download apps on your Apple Watch - Apple Support

"Get apps with the iPhone that's paired with the Apple Watch

1. On your iPhone, open the Watch app.
2. Tap the My Watch tab.
3. Scroll to the app that you want to add. Apps that you can install appear in the Available Apps section.
4. To add an app to your watch, tap Install.

If you can't find an app

• On your Apple Watch, apps appear on your Home screen. Press the Digital Crown to see the Home screen.
• If you don't see an app on the Home screen, you can see a list of apps that you bought and redownload them. When you redownload an app, you don't have to pay for it again.
• Some watchOS apps are not currently available in every region or language. If you can't find the app in the App Store or on your Home screen, see if the app is supported in your region."

If you need additional help with this, reach out to Apple via the link below:

Contact Apple for support and service

Take care.

Hey EngineerMama27,

If we understand correctly, you are trying to install an app on an Apple Watch, but it will not download the app. Let's get a little more information to help narrow this down.

Are you able to download any app?

Are you able to download apps on the iPhone?

Are you connected to Wi-Fi data?

This article has more information about downloading apps on the Apple Watch that may help. Download apps on your Apple Watch - Apple Support

Thank you for using Apple Support Communities. Have a good one.