Reb Yitschak daughter of Bracha and son of Dov  Magid  -a descendant of Dov Ber ben Avraham of Mezeritch , also known as the Maggid of Mezeritch/

Reb Yitschak married Sheindel Gitel daughter of Arie (Leib) Dov Glickstein . The family lived on Sienkiewicza 20 in Ostrowiec.

Their children who died in Holocaust  were:

Yosef

Rabbi Moshe Gershon , Rosh Yeshiva of Ozarow and Sandomierz (Zosmir)

Avraham Yaacov - he was 14 years old when sent to Treblinka

Yitschak was murdered by the Nazis on the street while returning from visiting a mourning house . His wife and 3 of their 5  sons were sent to their death in Treblinka.

The 2 surviving sons were Yechiel Rosenberg who moved to Brazil and Efraim Rosenberg [who was considered the Magid of OStrowiec] who moved to Israel.

Yechiel (Chil) Magid Rosenberg was very involved in writing about Ostrowiec and had 7 articles written in the Ostrowiec Yizkor book of 1971 in the following pages: 141, 165, 170, 218, 220,  322, 326 . He passed away in 1970 , in his early 50's.