It would be really helpful if the bottom of the ledger where the family balance is displayed would show up red if there is a past due balance. It can be hard to catch if a different family member is in or if there is other treatment already posted to the account at a glance. Maybe if the family file box was highlighted red if past due and green if current. We are very visual in our office, so color codes are huge!
In our latest versions, this is a feature we have implemented.