Peter Griffin Jr.

Peter Löwenbräu Griffin Jr. was a child of Peter and Lois Griffin who died in early childhood.

History
When Lois tasked Peter Sr. with babysitting Stewie, she told him that she did not want what occurred last time he babysat one of their children to happen again. A cutaway gag/flashback reveals Peter Sr. comforting and apologizing to a distraught Lois at Peter Jr.'s recently buried gravesite. He further tells Lois that he thought Peter Jr. would eventually stop crying if he " him enough". After a brief pause, Peter Sr. states that he "was kinda right".