You probably already know that UNC-CH is squirrelly for OOS, b/c of their cap on OOS students.
I hope the ratio of you : the story of your uncle/grandfather + vaccine ethics in your essay is the right way round. The point of the exercise is for the AOs to read it and think ‘this is just the kind of person we need to be part of our campus community’. IOW, it’s about showing you and your strengths, not telling stories about other people.
The number of ‘here’s the tragic/inspiring story of how I decided to be a doctor’ essays that AOs read every year is staggering: make sure you don’t get lost in the telling of it, and watch out for clichés. Princeton in particular is going to want to know what you have done with your realization: what have you done that shows how you took these events that were life-altering for you and acted on it. They say ‘if you tell us that you learned something major from an experience, we want to see what you have done with what you learned - how you have acted on it, taken it to the next level?’.
Based on skimming your other threads, if you really want to go to med school, I wouldn’t have Cornell on the list (tough on GPAs, which matters a lot for med school), or BU (don’t see what it adds over your in-state flagship or NMF options, for a whacking lot more money). Because you have a healthy, but finite pool of money for UG + G, any place that takes more of those $$ than your in-state flagship should be enough “better” that it’s worth the extra $$- and imo BU is not.
Well, no, it’s not, but- is there anybody on CC who doesn’t think that their demographic is the hardest one for getting into “good” colleges?!