leaving pt with a teen?

Hi PD nurses! Was hoping an experienced PD nurse could just verify for me this is appropriate. Well, more that it is safe for my nursing license. I've been doing PD over 4 years now, but never had this situation before. Some things that are normal for PD would not be normal in other settings (so I have learned over the last several years.) My agency told me it was just fine and the situation was kosher. But wanted an opinion or two.

Anyways...Is it okay to leave the pt in care of the older sibling that is 16 yrs old? Usually the nurse would be at the house until parent got home from work, but for various reasons they want to change this for 2 days of the week, and the nurse will leave the pt in care of the older sibling these 2 days. It is the parents request, so parent (and teen) is okay with it since it was their idea. The sibling would be with pt for about 3 hours until parent got home. Additional info: The 16 yr old sibling is very mature and trustworthy. The pt is long-term permanently disabled and very stable despite the disabilities. The older sibling knows how to give care to the pt. So, my point is that I feel comfortable with it on a personal level in that the 16 yr old is trustworthy and knows the care basics. BUT what about otherwise? What if something went wrong after I left?? Could I be sued becasue I left the pt with a 16 yr old?? My agency says that once I sign out my responsibility ends. But just hoped for verification.... Has anyone else ever left a pt in care of a teenager?? THANKS.