Families in the game Senatry are an important part of the course of the game.
You can choose a family only once and cannot abandon it, even if you would like to.
You can only choose one. However the game is well balanced so it does not matter too much which you choose. All families are fairly equally spread throughout the game. Once chosen, you will be able to chat in the world chat (which costs 'speakers'), family chat, league (if you are part of a league) and private chat.
It is not possible to deselect any of those yet.