We don't know anything. But dad and girlfriend earlier described a CPS case
in which the kids were taken from mom and her prize of a boyfriend and placed in their care for several weeks (a couple months), due to abuse allegations. No mention of how made the initial report. The girlfriend stated the kids were being physically and sexually abused. Dad's expression to me seemed unsure on the sexual abuse part. I think these were allegations that ultimately weren't proven to the satisfaction of the courts.
At the time of that interview, during which the biodad and his girlfriend seemed destroyed, sobbing and immediately talking about Mariah in the past tense, stating they knew something like this could or would happen, they stated that no one listened to them and the mom came into court I think lying, with paperwork used to perhaps make it seem she had satisfied court conditions? I'm reading between the lines here.
So the kids were returned to mom.
The latest report appears to have resulted from interviews with the boys in the course of the investigation into Mariah's disappearance. I believe LE made the CPS report.
I believe LE did, too, but I'm still baffled why the father would be given a copy of the report to keep. By talking about it, I think he's really harming his chances of getting custody returned to him.