What did Barron Trump whisper in Joe Biden's ear at Trump inauguration? Their mysterious handshake sparks buzz online

Donald Trump inauguration: While Donald Trump's inauguration as the 47th US President made headlines, it was a brief exchange between Trumps youngest son, Barron and former President Joe Biden that captivated social media. Barron Trump's mysterious handshake with Biden has sparked buzz online. But what did Barron Trump whisper Biden's ear?