There is a problem with these two trees
https://www.geni.com/family-tree/index/6000000077811382800
https://www.geni.com/family-tree/index/6000000077813447103
There are death notices for both brother and sister Emanuel and Johanna Fisch of Debrecen
https://dspace.oszk.hu/handle/20.500.12346/231627#
and
https://library.hungaricana.hu/en/view/Gyaszjelentesek_DebreceniRef...
Emanuel's is the earlier of the two death notices and confirms that Johanna (the wife of Ede Mandel) was his sister.
There are also death registrations for Emanuel and his sister Johanna Fisch but they give Emanuel and his confirmed sister Johanna Mandel nee Fisch entirely different sets of parents
.death of Emanuel
https://www.familysearch.org/ark:/61903/3:1:33S7-9TFS-9W5Y?wc=92Q9-...
death of Johanna
https://www.familysearch.org/ark:/61903/3:1:33S7-9TXG-9F5B?wc=92QM-...
Although the conflicting death records have made it necessary to sever the brother / sister relationship, I just need to put it on record that I have certain reservations about having done so.
Roy