Two of Hermann's children, Dorel and Isidor, were born in Koslow. The JRI-Poland record of Dorel's birth and Isidor's marriage certificate name their parents as Herrmann or Hermann Tworger and Philippine Cohn. The same parents are also named in the JRI-Poland record of Eva's birth. Philippine died in Koslow a few weeks after Isidor's birth.

Records exist of the deaths of the children of a Herrmann Tworoger of Koslow, but it is not certain that this is the same father because the records do not name the mother. The children are

• Rebecka, died 28/03/1853 aged 6 years so born 1846-47 and
• Sophia, died 09/08/1854 aged 5.5 years so born early 1849.