Final answer:
In the text, the mother's reaction to the father's leaving suggests that she believes she can live without him. Relevant themes from provided excerpts include coping with abandonment and change.
Step-by-step explanation:
In The Third Bank of the River, the mother's reaction to the father's decision to leave most likely indicates that she believes she can live without him. The various excerpts provided do not directly relate to this story but offer insights into themes of abandonment, decision-making, and coping with change, which are relevant to understanding characters' reactions to separation. For example, a woman facing a new life alone after her family leaves or a character's acceptance of a situation resonate with the idea of confronting life without a once-central figure.