Howie Carr,a local Boston talk show host and long time "fan" of the Kennedys would do much,much better at this,but I'll give it a try.Please keep in mind that I'm working from memory here.
Ethel's kids:
Joseph,driver of a Jeep that overturned,resulting in the permanent complete paralysis of a female passenger
Michael,investigated for having molested a young girl who babysat for his kids.Killed in a skiing accident while the investigation was still in progress.
A daughter (Rory?) married a convicted IRA multiple murderer.
A son (David?),died of a heroin OD
Somehow,I think there's more....but I'd have to research it.
Rumor was one of the Kennedys was having an affair with a neighbor lady and also her underage daughter. What a family.