Oedipus complex

The Oedipus complex, in psychoanalytic theory, is a group of largely unconscious (dynamically repressed) ideas and feelings which concentrate on the desire to possess the parent of the opposite sex and eliminate the parent of the same sex.[1][2] According to classical psychoanalytic theory, the complex appears during the so-called "oedipal phase" of libidinal and ego development; i.e. between the ages of three and five years, though oedipal manifestation may be detected earlier

http://en.wikipedia.org/wiki/Oedipus_complex