Family library did not require any device updates (apart from Fire which lets more than one person logon to the same device). You simply enable the device (or app) in Manage Your Content and Devices to participate in it.
So for example, after registering a Kindle Keyboard to my wife (our accounts are linked for FL), we could go to MYCD for her account and flip the switch that lets it see items for my account (in this case, books and audiobooks). That device didn't receive and update (for that: I understand there was a recent update to fix the Experimental Browser so you could login to Facebook and Twitter again). Likewise the Kindle app on her iPad can see my library. It's all set up on the server side.
I wish Music were included for FL (including Prime Music, as our accounts were linked for free Prime shipping). Apple's Family Sharing includes this.
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