Szlama Ber (Szlamek) was born in Izbica Kujawska near Koło on 23 September 1911 (or the 10th, in Julian calendar) to a Jewish merchant Iccak Wolf Winer (35 years of age) and Srenca née Laskow, his lawful wife according to birth certificate from the Office of Public Records.[2] They lived in Izbica just north of Chełmno before the Holocaust.