Norman Douglass: yikes. Reading both English and German wiki, I see his mother was a von Pöllnitz (!). Who remarried after his father's death (an Austrian painter), so maybe his beef with German widows is autobiographical and Hamletian? German wiki doesn't mention the 12 and the 10 years olds, only the 15 and 16 years olds, but otoh it has this detail English wiki has not:

1897 kaufte er am Posillipo bei Neapel, Italien, eine Villa (Villa Maya). Er begann ein Verhältnis mit dem 15-jährigen Bruder seiner damaligen 16-jährigen Geliebten.

Okay then. Also, in his later divorce he got the two kids, because his wife's infidelity. At least he didn't lock up his wife? But yeah. I bet Giuliano Dami's age when meeting Gian Gastone wasn't a problem for him...