@prefix owl: <http://www.w3.org/2002/07/owl#>.
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>.
@prefix : <foo://bla/names#>.
:kate a :Person; :name "Kate"; :child :john.
:john a :Person; :name "John"; :child :alice.
:alice a :Person; :name "Alice".
:child rdfs:domain :Parent; owl:inverseOf :parent.
:Person owl:subclassOf
 [a owl:Restriction; owl:onProperty :parent; owl:cardinality 2].
:Parent owl:equivalentClass
 [a owl:Restriction; owl:onProperty :child; owl:minCardinality 1].
:Grandparent owl:equivalentClass
 [a owl:Restriction; owl:onProperty :child; owl:someValuesFrom :Parent].