Apply ID won't work?

**MY iPHONE IS A 6+**
So I have a child's apple ID, and it works fine, (so it sends permission to my parents for the app), but my parents have Samsung phones. Except for the fact my mom still has her apple ID. Before iOS 11, it worked fine, but after it stopped working. I'll have her signed in to the iTunes option in Settings, but when we try to download an app on my phone from the app store, she keeps having to sign in again and again, and it never downloads. I tried calling apple and their only option was to make my child apple ID an adults, and I don't want to do that. Is there any way to fix it?

How can I check public records of a landlord?

Make a brand new Apple ID.