he does seem to have kept Dijanna's family to ransom to a certain extent. by the sounds of his previous rants.
Aside from those execrable letters he sent to Dijana, for which I have no words, the way he blackmailed her long-suffering parents with the threat of denying them their only grandchild (at the time), demonstrates the emotional response he reverts to, time and again, are the crumbs he picked up at the table of a controlling and abusive cult.