Two members of the Kennedy clan were arrested for refusing to tone down a raucous party early Sunday.

Police in Barnstable, Mass., collared Matthew “Max” Kennedy, 52 — the ninth son of assassinated former New York senator Robert F. Kennedy — and his daughter Caroline, 22, at a home near the family’s famed Hyannis Port compound at 1 a.m.

Cops showed up after several noise complaints about the rager, where party-goers were also lighting off fireworks. Officers asked them to keep it down, but they refused, so police cuffed them, according to CapeCod.com.

The Kennedys broke a local noise law, which is punishable by a $100 fine and arrest, according to Barnstable Police Lt. John Murphy.

“It’s a loud party statute, that’s what it’s used for,” he told the Boston Herald.

No one else was arrested, the Herald reported.

Matthew pleaded not guilty at his arraignment Monday. Caroline Kennedy will be arraigned at a later date. Both were released without bail.

With Post Wires