Translation:The boy is independent.
You can't use an apostrophe here, " the boy is independent " or "the boy's independence"
την ανεξαρτησία του αγοριού = the boy's independence?
Is there any relations to the word "annex"?
Annex comes from Latin word for to connect, so in a real sense it would be hard for this Gk word to be any more different.