I filed for divorce 5 years ago from my ex-husband... He signed our child's Birth Certificate and I know our son is not biologically his child. He refuses to take a paternity test and I want him out of our lives. I told him over 4 years ago that our son was not his... He still refuses to take a paternity test and my lawyer told me that it's been too long now and there is nothing I can do about it because my ex is still paying child support and seeing my son. What can I do?