Athena, disguised as Mentes, suggested that Telemachus emulate Orestes. Orestes. Orestes was famous for avenging his murdered father, Agamemnon. His father was murdered by Aegisthus and Clytemnestra, who was Agamemnon's wife. In revenge, Orestes murdered Aegisthus and Clytemnestra.
I am sorry I couldn't answer the last question