I need an outside perspective. I dropped off my nieces that live with us and my other two niece and nephew that are visiting from another state at their cousins birthday party. Prior to that I told my sister to call my sister in law to let her know, but she didn’t. When I got there my sister in law started asking me questions in front of her friends.

“Where’s mom?”

“Where’s your sister?”

I told her my sister is with her baby putting him to sleep.

“So now I’m stuck babysitting her kids?”

Mind you my other younger sister is at her house helping her out.

I told her I can take them back if she wanted.

“No it’s fine, I just didn’t know they were here”

I’m anxious and uncomfortable the whole time bc it feels like she’s interrogating/ humiliating me so I just want to leave. So I told her I gotta go I have to start getting ready. When I get back I told my sister and my nosy mom that my SIL was acting weird and I told my sister that SIL said she should’ve called and I told her that too, and that she was asking why she wasn’t there. My sister responded with “of course she did” anyways I go upstairs and my mom goes after me and told me to think a little bc I’m causing conflict and then she calls my brother to tell him about it (idk what she actually said). Today in the bathroom at church my SIL confronts me and says shes heard I’ve been saying mean things about her and that if I’m hurt with her or something to tell her rather than saying things. It came off that apparently I was saying that my SIL does NOT want my sisters kids there. She said it must’ve been a miscommunication with my sister and my mom. I genuinely do not remember saying that to my sister/ mom and I wasn’t trying to make it come off that way.