Kindle Library
There is no way to set up Kindle Family Library from the Amazon web site, or from a device running a Kindle app (such as an iPhone or Android phone), so if you don’t have a recent Kindle, you simply cannot use this feature. I find this surprising for two reasons. First, Amazon is saying that they have this great feature that is supported by every device they’ve ever made, but you can only turn it on if you have a recent device. Second, the settings are a bit confusing, and would be a lot easier to manage on the web.