Ex h was an alcoholic and violent physically and sexually over a 7 year period. At the time I think he was mentally unwell. This included violence in front of our children and he also encouraged DD1 to join in. There are numerous examples of damaging behaviour that he did in front of her. We finally split when DD1 was 6 when I went to the police, he was prosecuted. He has never shown remorse. Since then he has gradually recovered from alcoholism and become a bit more normal, although still emotionally abusive (maintains his behaviour was my fault).
Now 10 years later, DD1 (nearly 16) has developed mental health issues and has now been admitted to adolescent inpatient unit for assessment. I am in bits worrying about her. She has had a stable life for the last 10 years (although very stressful around the time of divorce as had to move house and area). However, she has always struggled with social interaction and now is showing paranoia and hearing voices :(. Ex h keeps on that this is my fault, his anger during our marriage was apparently caused by me and he has recovered since we split, he claims that I have also now had the same effect on DD1. My DH and DD2 are both fine, not suffering mental health because of me 
. He says DD1 needs a new life and he intends to take her away to live with him.
I am so worried that this might happen. DD has often said she does not want to live with him when asked by him but is there any chance he could succeed given the background? So tired of his endless nastiness which is so undermining. As a parent in this situation, you already feel that things must be your fault without the ex blaming you too. And he has never paid a penny in child maintenance and does not show much interest at all in DD2 who is disabled.
Sorry this is so incoherent, have been awake worrying for hours.