query: #Most popular fathers
  SELECT  (SAMPLE(?father) as ?father) ?fatherLabel  (SAMPLE(?picture) as ?picture) (COUNT(?father) as ?children)
  WHERE
  {
  	?subj wdt:P22 ?father .
  	OPTIONAL {
  		?father wdt:P18 ?picture .
  		}
  	SERVICE wikibase:label { bd:serviceParam wikibase:language "en" }
  }
  GROUP BY ?fatherLabel
  ORDER BY DESC(?children)
  LIMIT 50