Can I share my purchase with my family?

Yes, if you purchase the Pro Features, everybody in your family can als access them for free. This requires that you set up a family in your Apple / App Store account. You find more detailed information on how this works on Apple's support pages:

https://support.apple.com/HT201060

💡 Apple only introduced family sharing for in-app purchases with macOS Big Sur and iOS 14. Make sure you have the latest system installed on your divices in order to use family sharing.