His aunt was married to a Kennedy-—he’s not a Kennedy.
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You just don’t seem to get it. The greatness, and, even more important, the glamour, of the Kennedys is such that it cannot be contained to ordinary bloodlines.
But the real proof is this: Michael Skakel proved he’s a Kennedy by getting away with murder for decades. Now, a full-blooded Kennedy would have either gotten away with murder for an additional few decades until he died of syphilis and/or cirrhosis, or he would have died in a pointless, daredevil “accident” before getting caught up with.