Sorry to hear you are going through this too. I can totally relate to what you said. I don't talk to my former classmates except my good friend who is also an ACoA.
My former boss had a voice tone which reminded me of my mother's and I used to get horrible flashbacks even from hearing her talking (I'm not in that job anymore). Unfortunately my sister "inherited" my mom's ways of talking/acting towards people and it's very hard to deal with her.