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Let him know the situation? :)[/quote]
I was under impression the context was "передай ему" in a sense of "tell him". Otherwise, the translation would be "pass it on to someone".

That's true to a certain extent. You could also say:

Передай Васе, что на улице дождь. (Thus conveying a simple fact.)

I would translate as follows:

скажи ему = tell him
передай ему = let...