Vittorio Ressel is not a son of Joseph Ludwig Franz Ressel, but the son of Rudolf Georg Ressel Rodolfo Ressel

Vittorio Ressel is not a son of Joseph Ludwig Franz Ressel, but the son of Rudolf Georg Ressel Rodolfo Ressel
I don't have a source in the narrower sense, but this genealogy seems to be quite well researched: https://erhardt-ahnen.de/index.php?route=%2Ftree%2Ferhardt%2Findivi...
And it's obvious that the geni-Version of Vittorio Ressel seems to be too old to have the children that are connected with him on geni.com. In addition, on geni there is another Viktor (German for Vittorio) who is exactly the one displayed on erhardt-ahnen.de and who is Rudolf Georg Roessel's / Ressel's son even on geni.com: Viktor Franz Roessel
Are you talking about those two
Vittorio Ressel born in 1826
Viktor Franz Roessel born in 1853, Sibenik - I can try to find source for this one - Sibenik books are online