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 Rivka , daughter of Chaim Nachum and Chana Topel (and sister of R' Moshe Yaakov )

Some of their children left Poland before the Holocaust:

• Mordka Majer (b.1904-d.1969)
• Moszek  (b.1916-d.1997)  Moszek wrote a book about Ostrowiec and his life in Brazil .
• Jacob David  (b.1919)

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

• Their son Shimon died in Bergen Belsen in 1945.

3 other children survived the war and moved  to Israel:

• Yitschak/Ignatz (b. 1913-d.1993) Yitschak was a heroic fighter in the Polish underground.
• Renya/Rina (b.1920-d. 2013) - later married Mr Sheves in Israel
• Ruja/Rosia/ Shoshanav (Niskier) Korn