To Vitaeviternus, what I found disagreeable about Kurzweil resurrecting his father was that Ray Kurzweil's father's consciousness has been dead for quite some time now. Just because there may someday be a man that looks like, acts like, and has similar memories to Kurzweil's late father, doesn't mean it will be the same person that already died.
I must smile just a little at this. I hope you will shortly smile a little too as I explain.
If Kurzeil clones and installs the memories of his father, then the clone who awakens will see himself
as Kurzeil's father.
He won't assume he might be "the same person".
He will remember that he is
"the same person".
To demand that there be a continuity of identity (which is what you are looking for) is to assume that there must be a "ghost" who is the real
Kurzweil's father who will be usurped by the "fake" father cloned with memories installed by Kurzweil.
It doesn't matter whether we call the "ghost" a "stream of consciousness" or "the same person" or by any other name you might choose.
If you are not your memories, then the "real" you must be something else.
And what would that be?
(And if the "real" you did not
have your memories then that won't help either, as we can see in amnesia victims who have lost their memories and therefore their identity).
So if you are your memories and we create another physical body through cloning that has your memories, the clone who opens his eyes will certainly think that he is you, just as certainly as you do right now.
After all, isn't that how you know you are you right now - because you remember
that you are you?
If not, then we are looking for a "ghost" of some kind by whatever name is applied to it.
And who is to say that if that is what you are assuming to be true, then that "ghost" would not be identical to the memories of the clone that opens his eyes?
All of this stems from not having these experiences in our current biological set up. Soon enough if they happen, then the assumptions of "ghosts" (the need for continuity of identity rather than simply the memories which create identity) will vanish.
If it walks like a duck, quacks like a duck, tells you it is a duck, and there is nothing else to look at to determine if it is the same duck or not, there you are.
You either go quackers or assume it is the same damn duck!