Troubled 2nd Wife

My new stepdaughter who is 14 has recently accused her new stepdad of sexually abusing her. I’m not sure if I believe her, but her dad does.

He contacted the proper authorities and they investigated it and decided that they didn’t have enough evidence to win a case. Her mother doesn’t believer her and is still letting her husband live there. Meanwhile, my 7yr old stepdaughter is still living with her mom and stepdad.

We asked the authorities what we could do to get her taken out of the house and they told us that it would still be a civil matter. Unfortunately we can’t afford an attorney right now. Any and all ideas would be a great help.