Not - Leonidas was a Spartan Greek, Alexander was a Macedonian. However Alexander's father Philip had faked up a Greek descent from Sparta so that he could enter a chariot in the Olympic Games (which was restricted to Greek citizens only).
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Alexander didnt have a sister, but his father Phillp had seven other wifes so Alexander had a lot of halfsisters and halfbrothers. One of them (half-sister) was Thessalonike 345 - 295 BC.
The Spartan Leonidas did not train Alexander the Great. The Leonidas who trained Alexander lived far after the Persian Wars.
King leonidas
Alexander the Great was the king of Macedonia.
King Kamehameha the great or Leonidas of Sparta
Aristotle and Alexander the Great are not related. Aristotle was born near Macedonia, but is not related to Prince Alexander. Alexander's parents were King Philip II and the princess of a nearby city as well as Queen of Macedonia for a little, Olympias. They were not in any way related, Aristotle was only Alexander's teacher.