Children and adolescents are natural users of software and hardware, both in school and privately. Consequently, the open source community should strive to make free software accessible to young users, and even embrace their ideas and abilities as valuable contributions. From the experience from Teckids e.V.'s projects, we will talk about how children use software, what contributions we have seen, and why even small contributions matter for the whole ecosystem. Also, we will discuss pedagogic and legal challenges, including how hostile terms of use of closed platforms lock out young hackers and how we could escape making them second-class FOSS citizens.