Based on the provided information, Yuki Wolf does not have any children mentioned. The details furnished describe Yuki's own life stages and choices within the narrative.
At the conclusion of the story, Yuki makes a significant decision regarding her identity and future. Key aspects of her development and choices include:
- Choice of Lifestyle: Yuki ultimately chooses to live as a human, a central theme in her character arc.
- Life Stage: She is depicted as having entered middle school, indicating she is still a child or in early adolescence at that point in time.
- Family Relationships: The information highlights her protective nature towards her brother, whom she defended from bullies at school.
Given that Yuki is shown as a middle school student, the provided details do not indicate that she has any children. Therefore, nothing happens to "Yuki Wolf's children" within the scope of the information provided, as their existence is not mentioned.