I can’t stand my boyfriends sister?

So, how serious is your relationship with your boyfriend? Do know that whomever you decide to marry , its a package deal and you will "marry" his entire family as well. If she is a substance abuser, you might wish to explore how to get her to accept help . One option would be a family intervention with the help of a specialized leader. Another choice would be to limit her contact with your children, either to being only in the supervised presence of yourself or another trusted adult (your boyfriend?), or banning all contact with her for yourself as well. Do this, however, and be prepared for an unending problem of alienation . You could also tell her that she's welcome in your home and around your children, but only at times when she is not substance abusing and that the topic is off limits in their presence. Again, be careful whom you decide to marry. Lastly, where does your boyfriend stand with all this? He should be backing you up and making it clear to her that your expectations and limit setting comes from him, as well. Good wishes,

You could talk to your boyfriend about not inviting his sister over so much (or at least not when you're there if you don't live with him). If you're both adults and he's so close to this sibling that he can't fathom life without her around all the time then you'll want to seriously consider whether this is the guy you want to plan a life with.

On the other hand, if you're still minors, he lives with parents and that's why Sis is always around... He's not going to be the father of your future children anyway so I wouldn't worry about it.

Clearly you are not feeling good to interact with her but if you decide to marry your bf you will have to either make sure she understands well what you expect from her. You also need to talk to your bf on this topic and once he starts backing you up and making it clear to her that what your expectations are and what will be the boundaries to be respected, hope it will work.

if shes doing drugs just turn her in

Honestly, you're not married yet, probably not engaged or even pregnant. Why are you all worried about your boyfriend's sister? Honestly, this is silly.

When we have kids we choose who they can be around and who they cannot. It's not rocket science.