Article continues below advertisementJesse Jackson's son didn't appreciate the subtle political jabs made during his father's funeral.The late reverend's child Jesse Jackson Jr. threw shade at former Presidents Joe Biden, Barack Obama and Bill Clinton while questioning how well they really knew the civil rights activist in a speech made during a private memorial service following the Democratic leaders' appearances at a public event one day prior."Yesterday, I listened for several hours to three United States presidents who do not know Jesse Jackson," Jackson Jr.