Trying to find an episode but can’t for life of me remember what it’s called
I’m almost certain it was between season 9-12, but I could be wrong.
I’m a little fuzzy on the beginnings of the episode, but I believe a woman turns up dead (either babysitter or the mum?). Blah blah blah, the older boy turns out to be the unsub, I believe he tries to lure his younger sister into the woods to kill her as well for some reason I can’t remember.
I’m sorry it’s so vague but it’s been a while since I watched the episode and I have memory issues
Edit: Ok I found it! Thank you Criminal Minds wiki. It was the episode Innocence from season 14. I had most of the details right, just none of the connective tissue. Basically he was the kid killed his mum because she was an adulterer and wanted to kill his sister because he found out his sister was his half-sister