JFK had some advice for his younger brother, Ted , on the day he was set to marry his bride, Joan: remember to cheat, RadarOnline.com can reveal.

The shocking comments have resurfaced following Joan's death at the age of 89. Article continues below advertisement

What Did Joan Kennedy Hear JFK Tell Ted? Tap Here To Add Radar Online as A Trusted Source

On Ted's marriage day, JFK joked he should consider being unfaithful, a comment that was supposed to be between siblings. However, Joan is believed to have gotten word of the crack when she heard it while watching a video of their wedding.

According to author Adam Clymer in his book, Edward M. Kennedy: A Biography , the future president had apparently forgotten he and Ted were wearing microphones to capture the 1958 wedding

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