Okay. Until you can pull your finger out of your ass and actually look after your own fucking child, I see no reason why you should be allowed near mine. You may be my sister, but I've seriously had enough. You're a damn adult. You're older than me. Fucking act like it.

And while we're at it, I think your boyfriend is a cunt, and I don't want him anywhere near my children.

I also don't want my children growing up thinking it's perfectly acceptable to have a revolving door for partners. So when you inevitably break up with this one (or he breaks up with you) I don't want to meet your new partner until you've been with them for a significant amount of time. If I don't like them, they won't be allowed near my children. Simple.

Now grow the fuck up!