@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>.
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix owl: <http://www.w3.org/2002/07/owl#>.
@prefix : <foo://bla/names#> .
@prefix person: <foo://bla/persons/> .

:uncleOf a owl:ObjectProperty.   ### required !!!!!!!!!!!
[ ] rdfs:subPropertyOf :uncleOf;
    owl:propertyChain (:brotherOf :child).
person:john a :Person; :brotherOf person:sue.
person:sue a :Person; :child person:anne, person:barbara.

:name a owl:FunctionalProperty.
:anne :name "Anne".   :barbara :name "Barbara".
:UncleOfMore a owl:Class; owl:equivalentClass
 [a owl:Restriction; owl:onProperty :uncleOf; owl:minCardinality 2].