Oedipus complex- during phallic stage boys develop incestuous desire to be with their mothers and have a murderous hatred for their father. Boys take the role of their father.
Also said girls of the same age experience pens envy, they desire their father.
Little Hans- 5yr boy who developed a phobia of horses after seeing one collapse. Freud suggested his phobia was a form of displacement in which his repressed fear of his father was transferred onto horses.