I can't share a paid app with a family member
If you have multiple Google Accounts on your device, you have to change the active account in the Play Store to the second, third, etc, one and make it active. 

Open the Play Store app, tap the 3 line menu, and you should see the active account on the left and the "unselected" account on the right, tap the icon on the right and go to the app, you should not be able to install it.