Thanks for the support guys. @Dream, I'll probably have to use your suggested response later today when she reaches out yet again. Even my BF is now absolutely done with them and he told me to ignore my sister and if she asks one more time he'll take it upon himself to tell them off and even wants to tell them not to visit at all if they can't understand shit.
I hope she will accept my decline, because it's not like I don't want them to visit. I would love to see my nephew. But if she doesn't, then damn, I don't think I can control my man
All that stress goes straight through to my daughter. She's kicked the whole time when I cried to my mom yesterday, and it wasn't her usual hour of activity. So I'm pretty darn sure it was getting to her. I don't want that just to accommodate somebody else, even if it's my sister and her son, whom I do love very much. But I have a baby of my own now, and she's the priority. If I want to care for her, then I have to care for myself. I'm sorry.

Thank God they live in the UK, that makes low contact easier

Anyways, it's 30 degrees Celsius here and I'm dying :)