I agree. IIRC, there were no members of the Kennedy family at the Skakel home or anywhere nearby the night of MM's murder. In fact, I don't think there were any Kennedy's living in CT at the time. RFK's family was living in McLean, VA at the time. I doubt they would have been hundreds of miles from home on a school night.
ETA: for those wondering, RFK's wife, Ethel is a Skakel. She was born and raised in the Skakel family. Her father was a wealthy industrialist, her parents both died in a private plane crash while traveling together on business. Michael Skakel is the son of Ethel's brother Rush, Jr. Ethel met Bobby when she attended a private girl's school in New York with one of the Kennedy sisters, Jean or Pat.
And please, don't start any CT that Kennedy kids drove 300 miles from VA that night, then made it home to VA in time for school the next morning. That would have been a roundtrip of over 9 hours, through/around New York City. :facepalm: