Changing Store AppleID login, Family Sharing, & app updates mess 🤪

Before Family Plans were a thing, my child had my old iPhone and I had downloaded apps for them under my AppleID to it. Fast forward to the future where I have an Apple family plan that shares my purchases with my child who is older now and has their own Apple ID.

They have signed into the App Store and can download without issues. For apps installed under my Apple ID back in the day, they still need my password to update them.

All previously downloaded apps won't update without my Apple password since they were originally installed with my Apple ID when they were younger & Family Plans weren't available.

Is there any way to fix this issue without deleting the apps, losing all the data associated with them, and reinstalling them? There's a lot of history in some of those games and apps that will be lost with a deletion.

Note, I have my other kids in this situation as well. I'm trying to get ahead of it for them.

Thanks!