Ptolemy VI Philometor
Cleopatra Thea was a daughter of Ptolemy VI Philometor and Cleopatra II of Egypt. She had two brothers named Ptolemy Eupator and Ptolemy respectively. Her sister Cleopatra III was Queen of Egypt and married to Ptolemy VIII, an uncle, who had been a former co-ruler of Cleopatra Thea’s parents. It is possible that Berenice, the fiancée of Attalus III, king of Pergamum is another sister.