New device questions.

Just got a new device, and just in time, JJ no longer updates on my old one. However, I have not figured out how to get my bought items restored on my new device. New device is an IPad Pro. JJ is installed via family shared account, because it was bought on a parent account before they did the whole family sharing thing where I could use my own account. Any idea how I link the game on my new device with my original account/save game/whatever?
Many thanks ahead of time.
Many thanks ahead of time.