Final answer:
The unions in the study are fragile due to factors such as lack of proximity between fathers and children, prevalence of single-mother households, and the significance of a strong parent-child relationship.
Step-by-step explanation:
The fragility of unions in the study conducted by Edin and Nelson can be attributed to several factors. One factor is the lack of proximity between fathers and their children after divorce. Research shows that boys who live or have joint arrangements with their fathers have lower levels of aggression, while girls who live or have joint arrangements with their mothers tend to be more responsible and mature.
Another factor contributing to the fragility of these unions is the prevalence of single-mother households. The majority of children from divorced parents live in households headed by their mothers, leaving many boys without a father figure in the home. This absence of a male role model can lead to challenges in maintaining a long-term relationship.
Lastly, the study highlights the importance of a strong parent-child relationship in promoting a child's adjustment to divorce. When the parent-child bond is strong, the child is more likely to navigate the challenges of the divorce process more effectively.