You are the winner, I hope to God that protective services are on this case. A normal 6 year old would have no idea about that behavior, but for having it practiced on him.
I think it is highly probable, although apart from an allegation made against someone for sexual abusing the youthful perp, there is very little they could legally do apart from offering services to the family, unless there are younger children in the home. That would be a different story.