These siblings wrote the book on youth mentoring. Big Brothers Big Sisters of America establishes and supervises mentoring relationships between adults and children ages five to 18. Its network of some 400 local agencies serves more than 250,000 youths. It pairs at-risk youth with adults for casual interactions like going to movies, sporting events, parks, and just being together. Adults, or "Bigs," are interviewed, screened, trained, and approved by the parent or guardian of the "Littles." Agency staff makes matches and a caseworker stays in touch with the pair to make sure everything works well. The group is funded by federal, state, and local government, as well as individuals, foundations, and companies.