Sen. Edward M. Kennedy, the lone surviving son in a famed political family who helped define national Democratic Party politics, suffered a seizure at his Cape Cod home on Saturday and was recovering in good spirits at a Boston hospital. Kennedy, 76, did not suffer a stroke and "is not in any immediate danger," said Dr. Larry Ronan, the Massachusetts senator's primary care physician. "He's resting comfortably, and watching the Red Sox game with his family," Ronan said. "Over the next couple of days, Senator Kennedy will undergo further evaluation to determine the cause of the seizure, and a course of treatment will be determined at that time." Kennedy's wife, Victoria, three of his children and his niece Caroline Kennedy were among those with him at the hospital. On Saturday morning, Kennedy felt ill at his home and went to Cape Cod Hospital. After a discussion with his doctors in Boston, the senator was flown to Massachusetts General Hospital.