Final answer:
The question revolves around legal issues of child negligence and supervision within the field of tort law, highlighting the consequences of failing to supervise children adequately and the potential for legal liability.
Step-by-step explanation:
The vignettes provided evoke issues related to child negligence and supervision, which falls within the scope of tort law, particularly the duty of care in relation to children. In the given scenarios, the adults responsible for child supervision fail to prevent harm to the children in their care, thus raising questions about legal liability for the resulting injuries or fatalities.
In the case of sixteen-year-old Carrie and her niece Jill, though unintentional, there could be an argument made for negligence due to leaving a young child unsupervised in an environment where injury occurred.
These cases underscore the importance of safe child care practices and demonstrate the potential consequences of failing to adequately supervise children. Questions of legal responsibility and negligence in such circumstances are central issues in the application of law principles to everyday situations.