Jeez, that’s messed up. It’s like she’s putting on this whole act for your dad and then shows her true colors when he’s not around?? Super toxic. Honestly, some ppl just get a weird kick out of controlling others or feeling like they’re “better” than them. She prob sees u as competition or some weird threat even tho that’s totally ridiculous. But it might help if u set some boundaries…even if u don’t say it out loud, just in ur own mind like, “I’m not gonna let her words get to me” type thing. Hang in there tho, you’re not alone in this, a lot of ppl have gone through similar stuff.
