PDF Reader Pro supports family sharing which makes it easy for you and up to six family members can use the app with Family Sharing enabled. In-app purchases can be shared with family members on macOS Big Sur (macOS 11.1 or later) and iOS 14. While If your OS is lower than macOS 11.1 or iOS 14, In-app purchase cannot be shared with family members.
Here is what you need when Setting Up Family Sharing:
- An Apple ID signed in to iCloud and iTunes
- iPhone, iPad, or iPod touch with iOS 8 and later, or Mac with OS X Yosemite and later
More about setting up:
How to Share App Store and iTunes Store purchases with Family Sharing