Bertram

Bertram is the overarching antagonist of Family Guy. He is the son of the Gym teacher, her partner through artificial insemination and Peter Griffin. Bertram's biological father, through a sperm bank mishap fixing, is Peter Griffin. Bertram has appeared in "Emission Impossible", "Sibling Rivalry"and in "The Big Bang Theory".

Relationships

 * Peter Griffin - Biological Father

Enemies

 * Stewie Griffin - Archenemy and Killer
 * Brian Griffin
 * Leonardo Da Vinci † - Victim