This is realistic, understandably this was generally something you saw with parents and children. Many parents would rather go with their children and die than let them die alone. The most famous example of this is with Dr. Janusz Korczak, the head of the Jewish orphanage in the Warsaw Ghetto. Dr. Korczak was a well known and beloved child development specialist and child’s author (think almost like a Mr. Rogers type figure) and a published scientist. Because of this during the great deportation of 1942 the Nazis offered him his freedom, though we do not know if they intended to go through with this had he agreed. Dr. Korczak refused to be separated from his children, and he and the 192 children he cared for along with his staff were gassed in the Treblinka extermination camp on August 7, 1942. None of the children were older than about 13 or so, and most were much younger so had almost no ability to survive on their own, Korczak knew this, and he knew what happened in Treblinka, and he knew he could not save the children, so instead he kept them calm, told them stories about how they were going someplace lovely in the countryside and stayed with them, letting them know they were loved, until the very last moment. Of course even here the use of the word “volunteer” is not quite correct, rather these were what should be referred to as “choice-less choices.” You could let your child die, alone and terrified, while you remain alive another day, unsure for how long, or you could try to go with them. Sometimes the Nazis may have stopped people doing this if they wanted workers, but usually not as they were all marked for death eventually.