https://mappingthelives.org/bio/4ba7d8db-7384-4f29-a6a1-85c255082607?language=en
This should be his wife: Lotte/Charlotte Israel, née Lobenstein/Lebenstein: MtL - Mapping the Lives
Scharlotte Lebenstein (Israel) (1884 - 1942) - Genealogy
Gedenkbuch - Gedenkbucheintrag
his daughter Lilly, married Neumann, born 1911, seems to have emigrated to Palestine: Lilly Israel (1911 - 1998) - Genealogy - she died in 1998
MtL - Mapping the Lives
his daughter Gerda, married Lindemann, born 1911: https://www.geni.com/people/Gerda-Israel/6000000008519772285
she also seems to have emigrated to Palestine: MtL - Mapping the Lives - she and Lilly were twins
Hans Israel, born 1903, died in 1940, according to this source: Hans Israel (1903 - 1940) - Genealogy