Proposal: Split out the familial relations into a domain ontology

[alanruttenberg]

There are a LOT of these - I stopped counting at 50 -looks like a third of all object properties are these - and they are so specific that I don't think they belong at the mid-level.

[alanruttenberg]

In addition

• They mostly don't have definitions, leaving the question of whether e.g. a step father is a valid value for 'has father', or an adopted person is a child - are these speaking to social roles or biological facts?
• Many should have disjointObjectProperty axioms, since I don't think you can be a mother and father at the same time (although maybe, if the steps, surrogates, and fatherness is considered a social role.

There's a tutorial about a familial relations ontology: https://oboacademy.github.io/obook/tutorial/fhkb/ that might serve as a basis for further enhancement if it becomes a domain ontology.