Sending hugs and wishing you continued strength, WTBH. Lillamy's suggestion to call the sexual abuse hotline is a good one. I've also called the local line and being able to talk to some one about everything that we were going through with the interviews and visitations was... To say 'helpful' is an understatement.
You are not failing your children. You have been and are continuing to fight for them and their safety through incredibly daunting and terrifying circumstances. That is not failure; that, my dear friend, is Courage. Just take it a moment at a time. You'll all make it through this. (((((hugs)))))