Option 1: When you first get the Kindle it will be registered to you. Go in to your Kindle library and send everything to the Fire (or just move it from the Cloud to the Device on the Fire). Then get your dad to register the device with his own account. Then he'll have your backcatalog, though he'll have to buy any future content himself through his own account (probably better that way anyway - those old folks tend to be mooches :P)
Option 2: download all the azw's to your desktop then convert them to mobi using Calibre (with some special add-ons), and transfer them to the Fire via USB. That way your father will have separate copies that won't interfere with your whispersynchage.
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