Hi everyone,
I've got a bit of a situation here that I'm not sure how to handle.
My younger sister (she's 25 and I'm 29) and I have never had a great relationship. We were cordial as kids, had our typical sibling quarrels, but as we grew up, we grew apart. To make a long story short, she chose the path of drugs and abusive relationships while I chose the path of getting my degree, making a life for myself with a great career and now a great man. I tried to be her sister and tried to help her as much as I could, but we had an event occur about a year and a half ago that I can't let go until she apologizes.
I have not had any contact with her since. She sent me a text to say congratulations on my engagement and suggested we talk, but when I replied saying thanks and sure, she disappeared again.
I've kinda moved on. Sure, I love my sister, but it's clear to me that she's not ready to have me in her life again and I've come to terms with the fact that she may not be at my wedding.
My mom on the other hand... hasn't. We have had a few conversations about it and I've told her what I need from my sister to feel ready to rebuild, but my mom chooses to ignore this. I had specifically said that I don't trust my sister and that if she were to come, there would be a set of rules (i.e., no guests, no drugs and she stays with my mom- since I don't trust her, this seems fair).
Recently, my mom pulled my MOH aside and asked her to convince me to invite my sister. She also told my MOH that she has already booked the hotel room for my sister and has already extended the verbal invite to her and her boyfriend.
I have a serious problem with this. One, it's mine and my fiance's day. Not anyone elses. We should get to decide who is there and who isn't. Two, I don't appreciate her meddling and trying to force a relationship between us. It makes me want a relationship even less!
Do I just give it up and let it happen? Or do I have the right to stand up for myself? How would I do that without hurting my mom? I'm terrified my sister will show up and be disrespectful and cause a scene- she really is a child in an adults body... A relationship can be fostered in the future when she decides to grow up, but I'm not ok faking it- and I don't believe that this should be centered around my wedding.
Help

Re: Mom forcing relationship with sister on me... Help!
And have security on hand at your wedding.
As far as your mother, you can tell her that you've told your MOH to cross-check with you anything she is told about your sister and you'll be telling everyone else involved in your wedding the same (and follow through), and that the subject is closed. Don't accept any money from your mother to pay for the wedding, and return anything she's already given you in order to keep her from using it as leverage regarding your sister.
Unless you allow them to control you. Dan Savage has the best piece of advice on this: the one leverage you have as an adult child over your parents is your presence. If they don't respect your boundaries, your wishes or you yourself, then they don't get to have you in their lives. Believe me, this works.
Is it hard? Hell yes. Does it a long time to drive the point home? Hell yes. Is it worth it? Hell to the fucking yes. Tell your mom the subject is closed. Tell her if she continues to bring it up the conversation ends right then and there. Hang up the phone, get up and leave, delete the emails and texts without responding. Do this every single time until she learns that no means no and you mean it.
Good luck.
Part of recovery (and detachment for the family members) is about allowing the addict to suffer the consequences of their own behavior. I hope my brother is still in recovery when we get married, but if he's not he's not invited either. Quite frankly, I don't trust the using version of him around potential gifts, an open bar or other people's purses etc. It breaks my heart, but while he was in rehab I was at NarAnon and know now that the right thing isn't usually the easy thing.
As for your mom, if your sister is an adult she can book and pay for her own hotel and transportation so it sounds like your mom is a pretty bad enabler, hence why she's pushing you hard. She's doing what she thinks is right, surround sister with family and a happy day and she'll realize what she's missing out on. She just doesn't realize how those choices can ultimately hurt in the long run.
I have a very similar situation. Except its my brother. I literally was extremely blunt with my mother on the subject. I honestly did not want him at our wedding however since it is a family event said I would allow him to come to the wedding but he was not to attend prewedding events and for my mother not to expect him to be in the wedding or part of it in any way besides as a guest. I also told my mother that if I determined he was becoming anything but a happy guest during the wedding or if I saw any partaking in any addictive items that he would be promptly removed. Harder part is that we are doing a destination wedding so he will be on site so I will be requiring his removal from the resort. This is where my mother comes in she is basically responsible for his behavior and I will remove him if necessary and I have made that plain to all parties.
As for my suggestions I suggest being very forward with your mom on this front do not hold back feelings here if something happens and you didn't say it you will regret that you didn't. Tell your mother that your sister can be invited since it seems you want her there but tell her that she is not to bring a guest (in my opinion that opens the door for more issues). I would also have a conversation with your sister prior to the event and tell her your expectations and if she doesn't follow them you wont hesitate to have her removed to prevent a disruption.