Rant/WWYD

My sister would straight out tell me wtf, and I'd do the same. So if I were you I would do that, and tell her to keep her mouth shut, but I know I can speak to my sister like that and we'd eventually get over it

Is she normally a gossip? Does she often exaggerate or make hyped up claims? Is your sibling dynamic such that she would enjoy having an area where she feels more "accomplished" than you. Ultimately it doesn't matter why, it's just plain rude to take details of someone's personal life that they've shared in confidence and share it with others in a judgemental way. If you were previously close, as you set this boundary, maybe let her know it has damaged your trust in her as a sister. 😕 I'd be disappointed too, but I also think she will do some growing up over the next few years and you'll be able to recover the relationship and restore your trust in her if she's willing to apologize.

I’d find someone else to vent to. Keep conversations bland with her. She’ll notice and ask or she won’t. I had to so the same thing with my brother and sister. It just is what it is. I don’t hate them but conversations can’t be more than small talk

She most likely was the same when she was a ftm, but she’s forgotten how hard babies are because her first is 4 years old now

Definitely dont go to her anymore. Does she know that you know what she said to your family? If not I would ask her what she thinks and see if she's honest. If she's not and says your normal or whatever then confront her infront of your family that way she's put on the spot because she seems to like to twist what you say. So I would do it in front of others that way they can see the interaction.