How on earth can your bipolar be reason enough for your OH to not see his kids???? As long as you aren't full of rage or violent I don't see how she will get her own way. I have social services involved as my eldest struggles to put on weight she takes after her dad. They know about my illnesses and know I'm not a danger to my girls or society and they're fine with it! I know its not the same thing but its still official people involved so if they're fine with me that ought to be the same for you. One thing that could work in his favour is if you ask your psychiatrist for a report about how your condition doesn't affect the children in any adverse way and he could present it to the court. I hope it helps and try not to worry.