Apple's wording in its documentation is a bit confusing as regards to Android and Family Sharing:
Use Family Sharing with Apple Music on Android - Apple Support
"How to start and manage your own family group
When you get an Apple Music family subscription, you can start and manage a family group to share your subscription. Just follow the steps below."
Apparently you can set it up and manage in a very limited context, but not to the degree that you can if you have an Apple device. Set up Family Sharing - Apple Support only lists doing this on an iPhone, iPad, iPod touch and Mac.
As for your iPhone 6 being listed:
Use the information in this document to check your Apple ID device list to find where you're signed in --> Check your Apple ID device list to find where you're signed in - Apple Support
- Learn which devices appear in your Apple ID device list, how to find your device's details (including if it's a trusted device), and how to remove a device.
- Special section at the end on how to "Permanently remove a device from your account page"