Hi Cblue. Welcome!

I'm sorry about the difficulties with your sister. It sounds like she may have some issues of her own...
I think the majority of parents yell at their kids at some point (more like points). It's ridiculous that your own sister would threaten to report you for that. I wonder if CPS would laugh at her when she called?

I often get urges to write nasty replies via email. Once you hit send, you can't any of those words back, and time usually mellows me a little, so I end up feeling bad.
You may want to keep her at a safe distance for a little while because she's triggered some s/s thoughts.

I hope that you are safe now, and your shrink and/or therapist have come up with a plan to deal with moderate to intense s/s urges.

Thank you for posting! You're not alone.

Kay