Gender: boy
School:
School #13B
After inputting 'Mosze Gryncman' in the search with fuzzy parameters, 4 results came up, of which Mojsze Grycman was the only one born within the time frame to have been the age to have signed the book.
Mojsze had a father (Manes, b. 1900), a mother (Chana, b. 1901), and a sister (Chaja, b. 1931). In addition to all having lived at the same addresses, they were all deported on the same date, March 20, 1942. This was during the month of daily deportations to Chelmno.