Looking for a little support. (TW: sexual abuse)

I'm an ACON and I was sexually abused by my brother when I was around 3 years old. I told my Nmother about a year after the first incident; my mother was taking my friend and I somewhere and I'm not sure what the context was, but the conversation to both me and my friend was about knowing we could come to her at any point about anything. I spoke up and told her that my brother had touched me and her response was that I "should never bring it up again" and that he was "probably already ashamed of it". After we dropped my friend back off at her house, my mother reprimanded me for bringing it up in front of her.

Flash forward 22 years and I've suffered through the guilt and questioned if I had made it all up as my mother would have me believe, and I've been forced to maintain a cordial relationship with my abuser, especially during the holidays. It is what it is.

However, my Nmother just divulged that my niece has revealed to her mother/my sister that she was sexually abused as a child and blames my sister for not protecting her. My sister is devastated. She became a mother at a very young age and has always tried her best to provide for her children despite not having a lot or any sort of support.

My sister has been telling my niece how proud she is for her coming forward about her abuse and that she loves her. She, of course, wants to find out who abused my niece, but she understands that it's not that easy and is just trying to be a supportive mother.

Nmother has been telling my sister what a great job she's doing and how she "couldn't have said it better" and I just feel dead inside. I wonder if she even remembers me coming forward about my own abuse, or if she simply lives in denial. It's been incredibly triggering and I'm about to face my abuser in 20 minutes.

Worse yet, I'm concerned that my brother may have abused her at some point as well and if I had been better about coming forward, or found someone else to talk to that would have taken me seriously, that I could have prevented her abuse.

I'm not supposed to know about the situation going on, so I have to keep all these emotions to myself, but I wish I could reach out to my niece and give her my support as well as talk to my sis about it from the standpoint of a victim.

I guess I really needed to unload this somewhere. Thanks to anyone who read this...