query: SELECT ?person ?personLabel ?parent ?parentLabel ?uncle ?uncleLabel 
  { 
    ?person (wdt:P22 | wdt:P25 ) ?parent . 
    { ?parent wdt:P3373 ?uncle } UNION { ?parent wdt:P26 / wdt:P3373 ?uncle } . 
    ?uncle wdt:P21 wd:Q6581097 . ?uncle wdt:P31 wd:Q5 
    SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
  }
  LIMIT 10
  