If you are looking for quality summer camps in the Sterling and Lansdowne, I'd start first with
DMB Sports Camp - Home. They offer a variety of camps:
multi-sport, eco quest, art, cheer, flag football, field hockey and sport trek challenge for middle schoolers. Their programs are state licensed (you would be shocked to know how few camps are, and even under the county programs many are actually run by small independants who cannot meet the state licensing requirements--which is what schools adhere to). They currently do not offer preschool programs, but your kids will be of age for these camps before you know it!