There are many Bernices and at least two Cleopatra Tryphaenas. (The ancient Egyptians were not too creative with their names) If you mean Cleopatra VII's sisters, well Bernice was executed by her father when he returned to power and Cleopatra Tryphaena just disappeared from the historical record, although some researchers think that she may have ruled alongside her sister Bernice for a brief time.
No. Cleopatra didn't have to kill Bernice. Their father did it because Berenice and her husband usurped the throne from him.
bernice, Cleopatra Tryphoena
her sister bernice.
She had two sisters Bernice IV and Arsinoe IV. She also had a third sister, another Cleopatra.
Bernice (eldest sister) Cleopatra Tryphoena (2nd eldest) Cleopatra Ptolemy XIII Arisnoe Ptolemy XIV
Cleopatras mother was her fathers sister, Cleopatra V, Tryphaena and she was killed by Cleopatra's sister Bernice because Cleopatra and her father had left to rome and Tryphaena had taken the throne. Cleopatras father died of natural causes (or so is thought) in 51 b.c.
Bernice Ackerman died in 1995.
Bernice Cronkhite died in 1983.
Bernice Morrison died in 1947.
Bernice Gera died in 1992.
Bernice Lake died in 2011.
Bernice Lapp died in 2010.