Mission Statement Big Brothers Big Sisters of Orange County provides one-to-one mentors for children in great need to strengthen self esteem, improve academic success and pursue a purposeful future. Big Brothers Big Sisters of Orange County History Big Brothers Big Sisters of Orange County has been helping disadvantaged, high-risk boys and girls in Orange County make the difficult transition into adulthood for more than forty-six years. There are currently over 150 children in our community who are waiting for a Big Brother or Big Sister; they are desperate for that special person to enter their lives and make a difference. In the last 10 years, we have served over 13,000 at-risk children in Orange County and have seen amazing changes take place in their lives.