Final answer:
Eliezer was separated from his mother and younger sister upon arrival at Birkenau, a part of the Auschwitz complex. This was a common practice during the Holocaust, where families were often torn apart. The separation marked the beginning of a harrowing journey for Eliezer and his father, which was mirrored in similar fates for countless other families.
Step-by-step explanation:
Upon arrival at Birkenau, the concentration camp that was part of the Auschwitz complex, Eliezer, the protagonist from the book 'Night' by Elie Wiesel, is separated from his mother and his younger sister, Tzipora. The selection process, depicted in historical accounts and represented in various images such as "Figure: 'Selection' of Hungarian Jews," shows that men were separated from women and children, with the latter often being sent directly to the gas chambers. Eliezer and his father were separated from the female members of his family, a moment that symbolizes one of the countless personal tragedies that occurred during the Holocaust. This separation was part of the systematic process of dehumanization and extermination at Auschwitz II-Birkenau, which claimed the lives of over a million individuals.
Historical data, including notes on the Warsaw Ghetto and other fatalities in concentration camps such as Treblinka and Majdanek, highlight the sheer scale and organized nature of the genocide. The Holocaust was a period of intense and rapid murder, particularly from early 1942 until late summer 1943, when half of the Jewish victims of the Holocaust were killed. These facts emphasize the horrors that were the norm at camps like Birkenau, where Eliezer was forever separated from part of his family.