Does Drafts support Family Sharing where if you buy it then anyone in your family can install it as well?

Does it matter where you bought it?

The installation and use of Drafts is free. The pro subscription is an in-app purchase, which cannot currently be shared with Family Sharing due to limitations in the App Store.

Apple has announced Family Sharing support for in-app purchases is planned for release in the Fall, and we will likely support a family purchase option after those features become available.