Post tuition to a family

Show an entire family's tuition and allow posting to the family as a whole not dividing among 3 dancers inthe family.
IE: if a family is paying a monthly tuition of $500 and yearly tution of $5000, with child 1 taking 50% of the classes, child 2 at 30% and child 3 at 20%...rather than showing the % of tuition each child is responsible for, show the entire family responsible for $5000. SO THAT when using the transactions menu and keying in a check or cash transaction for the family that paid $5000, I don't have to figure out calucuations of the % of the total tuition each child 'paid' to get to the balance to $0.