Gender: boy
School:
School #1
A search for 'Ar* Lilental' rather than Ari Lilental turned up Arja, who was born in a year that would have made him young enough to attend school #1.
I was able to match Arja to the rest of his family via matching addresses. Arja lived with his father (Szlama, b. 1902), his mother (Zlata, b. 1906), and his siblings/cousins: Chil (b. 1923), Boruch (b. 1925), Chaim (b. 1929), Moszek (b. 1932), and Chawa (b. 1934), who all lived at the Goldschmidt address.
Arja, along with all the members of his family except Chil, were deported on March 25, 1942, during the month of daily deportations to Chelmno. Chil died of currently unknown causes on July 16, 1941.