If the children's parents/relatives died or went into the death camps, the child is sending into a different place, where they were going to have a different religion and being protected by the people who are taking care of them.
As you know, there were many children that were killed or alive. There are many names to the list who have survived then and now : Gitta Rosenweing, Regine Donne, Edith Knoll, Frank Siegel, Edith Schwab, Jack, Evelyn, Rachelle, and Rosetta Goldstein, Fran Greene, Roald Hoffman, Benno Horowitz, Kitty Saks, Charly Weingarten, and a lot more.