CORAL GABLES, Fla. — Juanita Castro considered her brother Fidel a traitor and had not spoken to him in 52 years, but, even so, she feels that a piece of her is missing now that he is dead.

Mr. Castro was reviled by many as a despot who had killed innocents and caused countless Cubans to flee the island, and when he died Friday night, spontaneous parties broke out in the streets of Miami. Ms. Castro expressed disdain for the thousands who danced and rejoiced over her brother’s death.

“Logically, that reaction hurts,” Ms. Castro, 83, said Sunday in an interview at her home in a quiet, well-kept neighborhood here in South Florida, where she has lived since 1964.

“It’s not necessary to do what the Cuban people have done here in the streets of Miami,” she said. “I respect the sentiment of everybody; I cannot accept this. It’s not a good thing.”