Big Brothers Big Sisters of Canada | 10,509 followers on LinkedIn. Enabling life-changing mentoring relationships to ignite the power and potential of young people | Big Brothers Big Sisters of Canada enables life-changing mentoring relationships to ignite the power and potential of young people. Since 1913, we have been matching children with adult role models in professionally supported mentoring relationships that help them achieve their biggest possible futures. Investing in young people's futures pays off, with a social return on investment of $23-to-1 through improved economic, health, and social outcomes.