False Allegations of Child Abuse?

I'm going to try to make this as short as possible. My fiancee's ex wife is alleging that their child was ually abused by my fiancee, which is not at all true. The statement that the 2 year old child supposedly made is obserd and the child doesn't even use the words that supposedly said. Apparently, the mother has coached him to say these things because she wants sole custody. She was really upset because the child calls his father "daddy" and she wants him to call his father by his first name. Also, the child called me Momma ___ and it really got her mad. He has been interrogated and I ume I will be too. This has been a terrible experience and it's taking a toll on us terribly. This whole thing is out of spite, and I understand that the police and DSS are doing their job, but I just don't understand how someone can have their child taken away over petty high school like emotions of the mother. Does she not realize what this is going to do to this child? Has anyone else been in this situation?