MrClass wroteYou should be fine. A single Apple ID can service up to 5 devices. Though also whatever extra apps you download will also be installed on his device.
Just create a gmail and apple ID for him. Literally take 5 minutes and is free of charge
Thank you for your reply. We do both have separate Apple ID's, but I made the new Apple ID in Australia because the game is not available in Lebanon. And I cannot make a new account for him because Apple decided to terminate new account openings only for Pokemon and are giving error messages, tried it all day today morning.