Some organizations offer a tuition discount for any families who have more than one student at the school. For example, the first student may be charged the full price, the second may get a 5% discount, third may get a 10% discount, etc.
At the moment, the system cannot automatically add a discount for any subsequent students in the same family. The best way to track the second, third, fourth, etc. siblings would be through an attribute, as they are added to the system. There are two ways to add this 'discount':