"All you gotta be is you." Be a Big Brother. "Enrich a child's life (& your own)." Be a Big Sister. "Do something significant with your significant other." Be a Big Couple. "Explore your community with a kid." In the community "Go back to school for the best hour of your week." Or On site. To find out more about volunteering with Big Brothers Big Sisters, click HERE. Definition of a "Big" A Big is an adult who provides a young person with support, counsel, friendship and positive reinforcement. Bigs are good listeners, people who care and people who want to help bring out the strengths in young people. Bigs are not Santa Claus, parents, social workers or babysitters. More questions about becoming a Big Brother of a Big Sister? Get answers here.