Can I download minecraft to another device?
Solution 1:
There is a lot easier way to transfer minecraft to different devices. Just use the google account you originally downloaded it with and sign into that on each device. Go to google play and go to my apps. It should be there to install
Solution 2:
Sure it is possible, but how much effort it's going to take depends on how you purchased Minecraft PE:
Google Play Store. This isn't available by default on the Kindle Fire. However you can sideload the Google applications (although it sounds like later updates or devices may not be able to connect to the Google Play Store without rooting your Kindle), or even sideloading the apps directly to your Kindle. Note if you follow the second tutorial, you technically don't need to install Bluestacks as you can backup Minecraft directly from your son's Android phone.
Amazon app store. Minecraft is available through the Amazon app store. If you purchased it here, you can install it on your Kindle no problem. Installing the Amazon app store onto your son's Android phone would allow him to also install Minecraft with your account. Easy hassle-free installs.