If a child from a single-parent family had lived with his mother for more than 20 years, had an Oedipus complex, and often slept with his mother, such behavior was reasonable.

For a child from a single-parent family, living with his mother for more than 20 years, having Oedipus, and often sleeping with his mother, this behavior could be considered normal emotional development, but it could also be considered abnormal behavior. Such behavior may negatively affect the child's mental and emotional health, but it may also be considered normal in some cases. The abnormal nature of this behavior depends on the child's specific circumstances such as age, gender, psychological and behavior characteristics, etc. If the child's behavior continues and affects his or her life and social skills, parents should seek the advice of a professional psychologist. Children from single-parent families may develop a strong emotional dependence on their mothers and want to maintain a close relationship with them. This emotional dependence may affect the child's behavior and interpersonal relationships, so parents should actively intervene to help the child establish healthy self-identity and emotional independence.