Personally I don’t think the facts are actually out there on just what he did or didn’t do.....the police, the parents, and the kid have all had differing stories.
So did the 15 year old actually have sex with the five year old?...that’s questionable as I see it.
At issue was, from a legal aspect, were the parents negligent in how they handled this happening. It doesn’t appear so to me ,with the understanding they had at the time. And apparently the authorities didn’t think so either.
All got counseling of some sort sufficient they all say they handled this 12 years ago and the girls seem to be doing ok with this as well....unfortunately the parents continuing to make this a media matter isn’t helping their situation and creating further issues IMO.
Results from studies of molestation and incest show that sexualized activity, which need not to include what you call “sex” (it’s not sex if one is too young to know how to repel an older brother ), isn’t required - just being treated in a sexualized manner is damaging or watching inappropriate films etc., even molesting hands inappropriately placed on the outside of clothing can be very damaging to young children; they They are not equipped to understand what is happening and what to do etc. and it’s worse that these are family members because from a very young age the girls were molested in their own home by their own “loving” family member so their own home and “love” even from family is not safe.