"Hi. My name's Joe. Nice to meet you".
I would start it out as blank a slate as possible. No pressure on the guy, no matter how hopeful the parents are that exposure to you will allow memories to flood back. What he'll "remember", if anything, is the way you interact with him. Treat him the same way you always would have, just don't bring any of your baggage with you.
He's under enough pressure, being asked to recall things and being held to standards and relationships he really doesn't remember. Be the guy that expects nothing from him. Let him figure out who he is, was, and will be on his own. He'll bring it up if he wants to, and he'll want to if he's comfortable with how you act around him NOW.
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