Alexander the Great had one full sibling, a brother named Philip III Arrhidaeus. Additionally, he had several half-siblings through his father’s multiple marriages, but the most notable one was his half-sister Cleopatra.
Philip III Arrhidaeus was born to King Philip II of Macedon and Queen Olympias, just like Alexander. Unfortunately, he was born with some mental disabilities, which influenced his role in Macedonian history. Cleopatra, his half-sister, was notable not only for her lineage but also because she was involved in the political maneuvers following Alexander’s death.
Overall, Alexander’s family dynamics were quite complex, with his relationships influencing both his ambitions and the historical events that followed his conquest of much of the known world.