Why did Cleopatra VII rule with her brother Ptolemy XIV after 47 BCE?

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Ptolemaic sculpture — Ptolemaic dynasty Head of a queen, marble sculpture possibly made in Egypt, Ptolemaic period (305–30 bce); in the Brooklyn Museum, New York. 14 × 12 × 11.5 cm.

After the death of her brother Ptolemy XIII in 47 BCE, Cleopatra VII was restored to the throne of Egypt with the support of the Roman general Julius Caesar.12

To maintain the established traditions of the Ptolemaic dynasty, which often involved joint rule among family members, Caesar elevated Cleopatra’s younger brother, Ptolemy XIV, to be her co-ruler and husband. This arrangement allowed Cleopatra to secure her position as queen while adhering to the political structures expected of the monarchy. She continued to rule alongside Ptolemy XIV until his death in 44 BCE, after which she elevated her son, Caesarion, to the position of co-ruler.231