Final answer:
In this case, the legal responsibility would depend on the jurisdiction in which the 29-year-old is located. Making threats to kill others, especially family members, is a serious offense and can result in legal consequences such as arrest, criminal charges, and potential imprisonment.
Step-by-step explanation:
In this case, the legal responsibility would depend on the jurisdiction in which the 29-year-old is located. Generally, making threats to kill others, especially family members, is a serious offense and can be classified as criminal harassment, assault, or even attempted murder. In many jurisdictions, threatening someone with harm, especially if there is evidence of intent, can result in legal consequences such as arrest, criminal charges, and potential imprisonment. It is important to involve the authorities and ensure the safety of the potential victims.