query: SELECT 
    ?item     ?itemLabel 
    ?kinship  ?kinshipLabel 
    ?gp       ?gpLabel
    ?father   ?mother 
  WHERE 
  {
      {
        VALUES ?kinship { wd:Q167918  } 
        ?item p:P1038 [ ps:P1038 ?gp; pq:P1039 ?kinship ]
        FILTER NOT EXISTS { ?item (wdt:P22