Have you really found out why the medication is rationed by the father?
Withholding it may be a control thing, which means you now have two whacky people on your hands to deal with.
What event led to the father being in possession?
When you describe that the guy doesn't get his meds when his dad is mad at him, why is the dad mad at him? Maybe the dad is mad because the son is begging for more meds not because the son forgot to mow the lawn or something...You are just getting one side of the story perhaps?
If you are going to even consider perusing this, you should know much more about that father/son dynamic and how that arrangement came to be. There's a story there...
But side note: I still think you should run.
