informal Will

The patient's son says that he helped the patient to craft a Last Will and Testament several months ago, when he first heard about the cancer. Rather than go to the expense of having a lawyer, they simply used some software that they found on the Internet. The son has witnessed the father's signature. 

Within this document, there is the phrase: "Do not prolong my life unnecessarily. I do not want to drag on like my brother did. Be merciful." 

What other information might you consider?