Explanation:
There are two possibilities when it comes to determining the biological father of a child.

Biological Father: The biological father is the man who provided the sperm that fertilized the mother's egg.

Social Father: The social father is the man who takes on the role of a father figure and raises the child as his own, regardless of whether or not he is the biological father.

Scenario: In some cases, a man may be the biological father of his son but not the social father. This can happen in various ways:

- Infidelity: If the mother had an affair with another man and became pregnant, but the husband raises the child as his own.
- Adoption: If a man adopts a child, he becomes the legal father, but he is not the biological father.
- Sperm donation: If a man donates his sperm to a fertility clinic, he may be the biological father of the child, but he is not the social father.

Conclusion: Therefore, while a man may be the biological father of his son, he may not necessarily be the social father. The social father is the one who takes on the role of a father figure and raises the child as his own, regardless of his biological relationship to the child.