Jettchen Daniel (Katzenstein) (1885 - c.1942) - Genealogy (geni.com)
Brother: Loser Katzenstein
See:
[CLI_Part_19] 132048933 - Leo Katzenstein - Dokumente - Talk in the Forum of the Arolsen Archives (arolsen-archives.org)
and
[CLI_Part_19] 132048935 Leo Katzenstein - Dokumente - Talk in the Forum of the Arolsen Archives (arolsen-archives.org)