It appears that there is a notion of events justifying parenthood relationships in a biological or legal sense. There is a notion of legal parenthood being equal to or equivalent to biological parenthood. The fact that the legal system may not acknowledge biological parenthood is not a contradiction to a more general concept comprising both biological and legal sense. In particular, such a notion should imply as default children being heirs, if the society supports such concept.
Superproperty of paths for was born – gave birth, was born, by father..
