Who is Moishele from The Cage and what is their importance?

Moishele is Riva's younger brother, he was as caring and loving as the others. When Motele was caught stealing wood and ordered to appear before a judge, Moishele went with his brother for "moral support." This was typical of the attitudes of all the children. Moishele was with Riva when she was taken to Auschwitz and was never heard from again.