Can I get some advice?

Story time: So my husband and I are in poly relationships And we live with our partners. In fact my girlfriend and I are doing a hand fasting this fall and will be spiritually married. And it’s a very happy household.

I posted a photo of my girlfriend and I kissing and I didn’t get too many questions but lately I’ve been having issues with my sister-in-law. We made plans for her daughter to come stay with us for the weekend and she asked if she could ask me questions about out poly relationships. I of course said sure I’d answer any she had. Well she didn’t have any questions other than wondering how open we were in front of our kids. I asked what she meant by open, because everyone has a different view on that. She ended up saying that we would confuse her daughter (who’s 11) and that she wants us to tone it down with kissing and whatnot. I told her I understood that but then tried to explain my side of things. She ended up getting really mad and told me that she didn’t want her daughter to be hurt. Well my girlfriend is trans and I took it to mean that she would hurt her, she also made homophobic comments about me kissing her. Then when I stopped talking because it kept going in circles and I got really upset because this is my family and she’s crossing boundaries with it. She then told me “Well, sounds like you’re not really open and honest with your feelings because you can’t even communicate?” She attacked me and my husband stepped in and got upset with her. She told him that I refused to cooperate with her and that I told her that we wouldn’t change while her daughter was here, which I never said, and made it to be that I was attacking her verses she attacking me. Which I could have because she does things with her kids that I don’t let mine do. Like allowing my children to be around a convicted pedophile. But I’m the bad one??

Do I move on and let my child go there? Or do I not let her? Did I make too big of a deal? I just wanted to defend my family and tried to explain it. I’m upset and my mom says I should just put my feelings behind me and move on but I can’t. I’m so confused and lost and just ughhhhh.

Any advice would be appreciated it.