Some reasoning results are hidden, how do i show them all?

:Parent  owl:equivalentClass  [
   rdf:type     owl:Class ;
   owl:unionOf  ( :Mother :Father )
 ] .

something like this

but when i query with reasoning opened nothing return

SELECT *
WHERE {
  ?s ?p ?o.
}

this works

SELECT *
WHERE {
    ?o rdfs:subClassOf ?c .
}

why?

and it sometimes shows

x a owl:Thing.

why this one doesn't hidden defaultly ?

INSERT DATA {
    :Parent  owl:equivalentClass  [
   rdf:type     owl:Class ;
   owl:unionOf  ( :Mother :Father )
 ] .
    
    :a a :Parent .
}

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