Hermes

Roman Name : Mercury

Parents: Zeus and the constellation Maia.

Siblings: Because he is the child of Zeus it is really impossible to name all of his siblings. Zeus is known to sleep with many women so he had many children. 

Relationships: He was married to Peitho. He also, like his father, loved women. He spent time with Dryope, Aphrodite, Penelope, and Crocus.
  Children: Pan, Hermaphrodites, Priapos, Lykos, Pherespondos, Pronomos, Eleusis, Autolycus Tyche.
 God Of: He is known for being a messenger for the gods but, he was also the god of thieves so you always had to be careful if you were around him. He was also the guide to the underworld. He would take souls back into the underworld. 

Symbol: Winged shoes, winged hat, and magic wand. 

Greatest Accomplishments: By following Zeus orders to kill the 100 eyed giant, he disguised himself as a shepherd and went to the 100 eyed monster. He accomplished this by telling him many boring stories to make him fall asleep, which worked. When he was asleep Hermes killed him. 

Worst Accomplishments: He was known to have sticky fingers. He liked to take things that caught his eye. Even at a very young age, a couple hours after he was born, he stole Apollos cattle.