add remote access.

I'm not new to TeamViewer but new to the community.  I use TeamViewer to control just two laptops.  My brother had TeamView11 on his old laptop and now is purchasing a new laptop.  What does he and/or I need to do so that I can control his new laptop by knowing his password? I assume he'll need to download TeamViewer12 on his laptop?  Is his password the same password I have used to get remote access to his old computer. Then what?   I want to be able to log into his laptop when he is not available just like I've been doing for several years.  As you can tell, I'm not too good at this but TeamViewer has been a great tool for me to help my brother.  Don't use it too much for my other remote access device (daughter).

Any help would be appreciated.

Leroy