The project Mensa for Kids, a cooperation between the federal state of Baden-Wuerttemberg and local student unions, offers children of graduates free meals in canteens when accompanied by their parent. This offer is available until the children are aged 10.
You only need to apply for the free 'Mensa for Kids' ID to benefit from this offer. To get the ID, you will need your student ID and a copy of your child's birth certificate or the family register.
In Heidelberg, you can get IDs in Marstallhof 1 in room 001 (ground floor).
In Heilbronn, IDs are available at regular opening times from the canteen management. In Künzelsau, IDs are available from Mr. Beck in the canteen, also at regular opening times.