If you'd like to share an App Store subscription across devices with your family members, you're in luck, because Apple has a feature that allows you to do this. Please tap on the following link and be sure to carefully follow each of these steps to get started: https://support.apple.com/en-us/HT201088.
*Note: If you are currently in the middle of a free trial, your Family Sharing will not work. Once your trial converts to a full subscription, please restart the whole family sharing process from the beginning.
If you run in to trouble, we recommend this article from TechNewsToday for problem solving help: Here's How to Fix Apple Family Sharing Not Working. If the article doesn't provide a solution, please contact us by tapping "Contact Support".