I can install apps on our family tablet using my personal Google account. Somehow I've set this up in the past, so I have all my devices under one Google account. Note that the tablet is officially registered on an other Google account.
I want to do this again for the tablet of my grandmother, but I don't know how anymore how I've done this in the past.
I have my grandmother's tablet here. How can I authorize myself to install apps on her tablet using my own Google account?
Thx in advance!