It is essential to clarify that in modern societies, marriage between close relatives, such as a son marrying his mother or a father marrying his daughter, is considered taboo, unethical, and illegal in many places. Such relationships are considered incestuous, and they are universally condemned due to the potential for genetic issues and the profound harm they can cause to individuals involved.
Thankfully, these types of marriages are extremely rare and uncommon in contemporary societies due to cultural, legal, and moral norms that prohibit such behavior. The vast majority of people abide by these societal rules and maintain healthy and appropriate relationships with their family members.
It is important to promote healthy family dynamics, mutual respect, and understanding between family members while respecting legal and ethical boundaries to ensure the well-being and integrity of all individuals involved.