• They develop a passionate desire to have sex with their mother
They want to possess their mother for themselves
• They see their father as rival ⇒ experience jealousy and therefore wishes father dead
• They are afraid their father will discover their desire for their mother and punish them by removing their genitals and "source of power": castration anxiety
• They recognise that their father is more powerful than them as he has a biggerpenis
• The child believes his father has castrated his mother
• In summary, conflict between lust for mother and fear of father