To what extent does Anja survive the holocaust?

Anja commits suicide in 1968, leaving both Art and Vladek in emotional turmoil. Art's last memory of his mother is recorded in a comic called "Prisoner on the Hell Planet," in which she enters Art's room and asks him if he still loves her. His response, a terse and dismissive "sure," haunts him for years.

Why does finny want them to jump side by side