Even with my husband's ex's documented history of assaultive behavior (police reports where she beat up a person up in mutal fight) and court cases documenting her anger issues and court orders that she never complied with to complete anger management classes, it took a year and me completing a domestic violence evaluation before the DA dropped the charges.
They have pretty solid evidence once there is an actual injury and the victim tells them who injured them. A very good lawyer is essential. Unless the children recant, the lawyer will have to prove a reasonable doubt that the children are lying and how they got injured.
How old are the children? If they are young it gets even harder because your lawyer may not be able to cross examine them in court.
I have never been so distressed in my life as the year I had to go through being falsely accused. If I would have had to go through an actual trial, I have no idea how it would of affected me. If I would have been convicted of something I did not do, that would have really changed me forever.
After the ex pulled this, and I realized that she could get away with it, for me that was the deal breaker. I was done. I will never go out of my way to protect my SD again. Fortunately, SD is old enough now to protect herself and confront her mother herself now (which she tells me she does quite often now).
Please post back with the progress and developments of your case. I will pray for you.