Re: Can he block the mortgage assumption process?
If the mortgage requires his approval, he can withhold it. Of course that won't necessarily prevent him from being held in contempt of court for violating its decision to award you the house. He would be interfering with a court order, and possibly the precise order to require him to complete the necessary paperwork to allow you to assume the mortgage. So that's why it might be best to ask an attorney.
In youth it was a way I had, to do my best to please, And change, with every passing lad to suit his theories.
But now I know the things I know, and do the things I do; And if you do not like me so, To hell, my love, with you! --Dorothy Parker