Can I list my aunt, who has been my primary caretaker, as my parent on the FAFSA application?

I have lived with my aunt for all of my high school and most of my elementary school years. She has cared for me and paid EVERYTHING for me. She also carries me as a dependent on her taxes along with my elderly grandpa. I am reviewing FAFSA application for college financial aid consideration. Can I list her as my parent even though there is no formal adoption arrangement? In my mind and heart she is my parent and has always been so.