How do I increase Apple Family size beyond 6 members?

I have 5 children with my wife. Apple Family limits the number of people in the family to 6 for some arbitrary reason. We are forced to do gymnastics with our accounts in order to get by and it saddens us that Apple is so limiting in this regard. Is there anything that can be done to increase the size of the family? Perhaps Apple could have an option that only two adults can be a part of a family of you want to add more minors?

[Re-Titled by Moderator]