you forgot JFK jr but again he might not served in politics, more if sr stayed alive
And there's RFK Jr. (let's leave out his views), and you guys still haven't mentioned Joseph Jr.
. It was only after he died that Joe Sr. shifted his political ambitions to John. If we go with all the brothers then we have four Kennedy presidents straight up, though you'd then have public opinion to deal with...
EDIT: BeardedHoplite beat me to it while I was writing this
, but Joe Jr. still would most likely have been president before John