Hey! Welcome to the Spotify Community :)
Basically with a Spotify For Family, you get up to six full premium accounts. This means that for each account you have in your Family subscription you get three offline devices.
For example if you have 3 accounts in your subscription you can have 3 offline devices times three accounts, making a total of 9 offline devices.
Hope this makes sense,
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Music is a world within itself, it is a language we all understand. ~ Stevie Wonder
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