Dov/Berek Niskier lived in Ostrowiec son of Aharon and Chaya/Chana Nisikier.

Dov had atleast one sibling known, a sister Basha who was married to Abraham Adler. Their 2 children Malka and Yehoshua were sent to their death with their parents to Treblinka in Oct 1942,

Dov married (on Aug 24, 1900) Rivka , daughter of Chaim Nachum and Chana Topel (and sister of R' Moshe Yaakov )

Some of their children left Poland before the Holocaust:

• Jacob David [Jakub Dawid] (b.19 June 1901]
• Mordka Majer (b.1904-d.1969) married Frajda Klajner on Jan 20 1925

• Moszek  (b.1916-d.1997)  Moszek wrote a book about Ostrowiec and his life in Brazil .

Dov and his wife were sent with most of the town's Jews to their death to Treblinka in October 1942.

• Shimon, their son died in Bergen Belsen in 1945.

3 other children survived the war and moved  to Israel:

• Yitschak/Ignatz [Icek Wulf](b. Sept 5 1913-d.1993) Yitschak was a heroic fighter in the Polish underground.
• Raca /Renya/Rina (b.Oct 1 1920-d. 2013) - later married Mr Sheves in Israel
• Rajzla/ Ruja/Rosia/ Shoshana (Niskier) born Apr 15 1906, married Lejbus Klajner  on March 24 1933 . He was murdered during the Holocaust. Shoshana later married Mr. Korn.