Merhaba - I think you did the right thing by cancelling the visa sooner rather than later.
You wrote: "If he is living with me he can stay but is not allowed to reside elsewhere - all addresses have to be lodged with the police..." Therefore, from a practical perspective, you would be knowingly associated with a violation of the visa terms if you did *not* report the status change, no? Maybe you would also be accruing fines and your own visa may be in jeopardy if his residence change came to light and you didn't inform the police.
I certainly would not take that chance if it were me, especially being in a foreign country!
I agree with Lexie: can you have your lawyer send him a letter..*after* you ensure that the sale of the home is blocked by the divorce case?
Sending you lots of good vibes.