If I buy an ebook an Amazon, can my son, with another Android device, read my books? When I buy a pocket book both my son and I can happily read it.

I bought some books on the Amazon Kindle store (which I read on my Samsung Galaxy S), and am now wondering: can my son read these books too ?

Knowing that the price of an ebook is not that much lower than a pocket version of the same story ( I even found some where the ebook costs more than the pocket equivalent ), I am just realizing that this could not be a good thing to do.

[--- UPDATE ---]

Having read the first few answers, I must clarify something: the Amazon account of my son is NOT the same as my Amazon account.

I think that for him to access my Kindle store ( as I do as well with my Archos 101 tablet ), I need to give him my login credentials, or am I mistaken ?

It's not a matter of trust that I should not give him my login credentials. It's just that, I have a lot of items in my wishlist/saved basked that are items I may give to him as a present. And of course , I do not want him to see these items.
As per their FAQ:


  How many Kindles can I use to access
  titles in my library?
  
  Most books you purchase from the
  Kindle store may be simultaneously
  accessed for your personal use on up
  to six Kindles or Kindle-compatible
  devices (such as Kindle for PC or
  Kindle for iPhone) registered to your
  Amazon.com account. If the limit is
  less than six simultaneous copies for
  a specific title, you'll see the
  message "Simultaneous Device usage: Up
  to X simultaneous devices, per
  publisher limits" on the Amazon.com
  detail page.
  
  If you reach the device limit and want
  to replace one of your current devices
  with a new one, you must first
  deregister and delete the content from
  the device you wish to replace before
  you can access the content in question
  from your new device. For device
  registration instructions, please see
  the Help page for the device you wish
  to register/deregister on the Kindle
  Support pages.
  
  Subscription content such as magazines
  and blogs can only be downloaded to
  one Kindle at a time and cannot be
  accessed from Kindle for PC.


So yes, you can read the ebook on multiple devices, but be aware that there is a limit of 6 (or fewer) devices.