Socrates, Pluto and Arastu (Aristotle) were Greek philosopher of Alexander era. There were no blood relation between them but teacher and student relation was there. Socrates was Pluto teacher and Pluto was Arastus.
Socrates: Street-corner philosopher
Socrates was the big-city philosopher in ancient Athens. Accused and convicted of corrupting the youth, his only real crime was embarrassing and irritating a number of important people. His punishment was death. He was famous for asking question and asking answer from people.
Plato became an enthusiastic and talented student of Socrates and wrote famous dialogues featuring his teacher verbally grappling with opponents. He was a man with plenty of money and a superb physique and Plato was just a nickname given to him by his friends, whose original connotation made reference to his broad shoulders.
Aristotle was Plato's best student and become the very well-paid tutor of Alexander the Great — probably the highest paid philosopher in history. Aristotle started his own philosophical school when he was 50 years old. Although he lived only ten more years, he produced nearly a thousand books and pamphlets, only a few of which have survived.