I agree with Leed. I have a habit of getting myself involved with issues that do not directly affect me, and it does not usually go well. If the situation affects your child, however, I do think you have a right to suggest that your ex-partner deal with the situation and make sure that she does not bring any of it "home." Are you sure that your continued co-habitation is what is best for your child? I don't have any background with autistic children but I wonder if they're more sensitive to stress and anxiety than other children....