Julia and Barnabas are both undeniably cruel not only to Adam but to Willie as well.
It looks to me as if Barnabas is just as much of a cold-hearted monster as he was when Willie first let him out of the coffin. Now I can understand his initial treatment of Willie, a no-good, two-bit drifter who went grave robbing one night and ended up getting turned into a willing thrall. But Barnabas has been "cured," supposedly, so where does he get off treating Willie like a slave?
Not to mention Julia - who does she think she is bossing Willie around like that, and threatening to have him committed for LIFE at the asylum if he doesn't obey their orders???
It seems to me that Willie should go straight to the police and let them in on some of Julia and Barnabas's secrets.