ouch. i understand how much you care and that you want to extend friendship and assistance; but the first thing that you possess (and other people in similar circumstances do not have) is a nursing license. that said, you are always a nurse first in the eyes of anyone outside of the healthcare field. the license can imply to those outsiders that any relationship a nurse has outside of work can be interpreted as a contractual agreement. people have different expectations from nurses and doctors than they do other professions.
that said, licensed healthcare professionals are held to a higher standard and there are expectations placed on us, and whether it is fair or right has nothing to do with it. i used to do home health care and some of my patients would need a ride to the doctor’s office or hospital and even though it may be less than 2 miles, i knew that i had better not do it. my insurance would not cover it if i were in an accident and if the person gets sick, injured, or hurt while under your care, right or wrong, you can be sued and your license threatened.
even if they are staying in your house and you state "i am not acting in a nurse capactity doing this" if anything happens, they will expect you to intervene and you will be held to that nursing standard. people will turn on you faster than greased lightening if something went wrong. same thing can happen if a neighbor comes banging on your door to ask you to look at their child's throat or to help with dressing changes.
it is important to establish that line of separation early and remember never to practice nursing outside of your place of employment and that you will forever have a license that can be challenged or threatened. i would suggest that you not do it. there is too much to loose for you, even with the best intentions and the most sincere heart.