About Big Brothers Big Sisters in Oxford County (BBBS Oxford): This year, Big Brothers Big Sisters celebrate 50 years of mentoring in Oxford County. Collectively since 1969, BBBS Oxford has been making a positive difference in the lives of local youth by developing and implementing a wide range of mentoring programs. BBBS Oxford believe in helping children realize their full potential through life-changing relationships with positive role models that inspire and empower them, as individuals and citizens.