DH and I have been split for a while but we having recently been working things out and talking about him possibly moving back home in the not too distant future. DD refuses to speak to him other than a grunt due to his very poor behaviour towards me and DCs during the period of separation. She does not want him to move back in. She's very much like her dad. Very strong minded and stubborn. DH has tried to talk to her but he is now not speaking to her much as she refuses to answer him. He's hoping that she'll come round. Any thoughts on how to handle this before it gets even more out of hand? DD is 12.