According to Freud, the stage in which children develop a marked attachment to the parent of the opposite sex and become jealous of the same-sex parent is the phallic stage.

Phallic Stage

A phase in Freudian psychosexual development where a child’s focus of libido is on the genital area, marking it as a critical stage in the formation of sexual identity.

Marked Attachment

Marked attachment refers to a strong emotional bond, typically between a child and a caregiver, characterized by the child's tendency to seek proximity to the caregiver for security and comfort.

Same-Sex Parent

A parent who is of the same gender as their child or who identifies as homosexual.