query: SELECT ?item ?bdate (CONCAT("{", "{Q\u007C", STRAFTER(STR(?mother), "Q"), "}", "}") AS ?mo) ?mddate (year(?bdate) - year(?mddate) as ?delta) WHERE {
    ?item wdt:P31 wd:Q5 ; (p:P569/psv:P569) ?bdate_node; wdt:P25 ?mother.
    ?mother (p:P570/psv:P570) ?mddate_node.
    ?bdate_node wikibase:timePrecision ?bprec ; wikibase:timeValue ?bdate.
    ?mddate_node wikibase:timePrecision ?mdprec;  wikibase:timeValue ?mddate.
    FILTER(?bdate > ?mddate)
    FILTER(?bprec >= 9 && ?mdprec >= 9 && (?bprec = ?mdprec \u007C\u007C year(?bdate) > year(?mddate)))
  }
  ORDER BY DESC(?delta) ?mother ?item