That's a terrible story; I'm sorry you had to see such awful evidence of abuse and participate in the family silence. I understand how everyone could fall into the familiar patterns of pretending nothing bad is happening; it's a lesson you all learned so very well.

I hope you will tell your T when you meet again. It is important to debrief something like that and decide what, if anything, you will do now or in the future in regards to the brother and SIL. Your T is there exactly for times like these. Bringing this in to session gives him a chance to really do his job, think of it that way!

I hope you can do some more self-soothing in the next few days. That must have been shocking and scary.