Neither of my parents attended schools that I am interested in, but my uncle attended a school I am interested in applying to. Does this constitute legacy status?
Depending on the school, it may or may not. Your best bet is to check the school’s website! It’s usually found in the Admission FAQs.
Usually an uncle would not make you a legacy but the above post is correct in that there is no one answer that fits every college so you should check each school’s website.
You can check on the application. School specific section will ask you if your relatives went to the school, and it would be very specific as what it considered to be legacy.