Son number three, RFK Robert Francis Kennedy was then pushed into the limelight and ran for president in 1968. He, too, was assasinated and never even had the chance to actually be the official candidate.
So the USA and the world got stuck with young, immature Teddy Kennedy who grew into a very professional politician, although his private life was less successful.
Joe Sr was known as an antisemite and friend of Nazis, especially during his time, pre-WWII, as United States Ambassador to Great Britain. I don't think his son Bobby shared those feelings. Lenny Ben-David has a site with RFK's articles about his visit to pre-state Israel.
There's a lot of amazing stuff in his articles. Here are a couple of excerpts:
Our government first decided that justice was on the Jewish side in their desire for a homeland, and then it reversed its decision temporarily. [Editor (Lenny Ben-David)’s note: In March 1948 the State Department reversed its support for partition and called for a UN trusteeship.]I just wonder if Bobby Kennedy would have been a better president than his brother had been, and would he have been more pro-Israel as a former president and elder statesman etc than others were and are since his murder.
Because of this action I believe we have burdened ourselves with a great responsibility in our own eyes and in the eyes of the world. We fail to live up to that responsibility if we knowingly support the British government who behind the skirts of their official position attempt to crush a cause with which they are not in accord. If the American people knew the true facts, I am certain a more honest and forthright policy would be substituted for the benefit of all.
The Jews on the other hand believe that in a few more years, if a Jewish state is formed, it will be the only stabilizing factor remaining in the Near and Middle East. The Arab world is made up of many disgruntled factions which would have been at each other’s throats long ago if it had not been for the common war against Zionism. The United States and Great Britain before too long a time might well be looking to a Jewish state to preserve a toehold in that part of the world.
Or would he, like all the others accept the anti-Israel ideologies of the State Department and be no different from the others. We'll never know.