While the upcoming Netflix drama series “ Kennedy ” will chronicle the famous political dynasty from 1931 to 1944, the family’s signature Boston accent won’t be so pervasive. Nick Robinson , who plays Joe Kennedy Jr., JFK’s older brother who was originally being groomed for the White House before he was killed in action during World War II, tells me, “We made the executive decision beforehand that we’re going to steer away from the Boston accent. So it’s subtle. Also, that accent has sort of