Legal fatherhood is determined by law. Biological fatherhood is determined by science/genetics. Also, adoption isn't a common practice. Adoptions happen, but they are rare.
Ideally, legal and biological fatherhood should be one and the same. That way you can find your genetic history for medical purposes and legal family tree for historical purposes. But tragically, in a few cases, legal and biological fathers are not the same.
Ideally, legal and biological fatherhood should be one and the same. That way you can find your genetic history for medical purposes and legal family tree for historical purposes. But tragically, in a few cases, legal and biological fathers are not the same.