In addition to her major in drama, Brianne decided to minor in child psychology at NYU, though she said she chose that minor "almost by accident." As she explained to Imagista, "I found myself taking all of those college classes, and before I knew it my college counselor was like, 'You know you basically have a minor.' All the classes I chose to take fulfiled the requirements for the child psychology program. I love kids. I am from a huge family, and I think I have always been curious to know why we are the way we are, which I believe all stems from our childhood."
Brianne has four younger siblings, and she told Complex that she's very close to her large family. "Both my parents remarried and had more, so three of them are much younger," she said. "It was cool to play a kind of different role in their life, being a little bit older than them. I'd be running them to their practices and helping them with their homework and just kind of watching them grow up." And though she feels a lot of pressure as the eldest, she enjoys being a role model. "It's nice; when you have someone looking up to you, they think everything you do is so cool," she added.