<human>: My fiance and I (F 21 and M21) have been engaged for a little over a month now, and we have been together offically for a year, but I have known him for 8 years. This is a throw away account as I have several redditor friends.

We both have a mutual friend who I'll call Zach. We have both known Zach for quite some time. Zach recently began taking hormone therapy and estrogen and has legally changed his name to "Sophie." My fiance and Sophie have always been great friends. When Sophie movied across the country for college, my fiance went and helped him move. They keep in contact quite often via text, Facebook, or phone calls. I occasionally talk to Sophie, but not near as much as my fiance. 

Here's my problem. My fiance wants Sophie in the wedding as one of his groomsmen(woman?) and I don't mind that she is in it. I did ask that he tell her to wear a pantsuit so that she matches the other. My real problem is this...

I have a quite religious family who would go mad findng out that she (who was formally a he) would be in the wedding. In fact, the few family members that know keep asking do I really want her in all my pictures, etc. 

I also found out when Sophie recently visited she was pretty handsy with my fiance, which I thought crossed a line but later found out she was doing it "sarcastically." Should I say something to her about it, or let it slide?

The question is: Do I tell my family that I have a transexual (or transgender?) in the wedding? Or let them find out when they get there? (also it's very obvious she used to be a guy) And do I approach her about her behavior with my fiance?

Give me the gist of the text in a nutshell
<bot>: Transgender friend is going to be in our wedding. Very religious family will probably freak out. Tell them? Also, do I approach the same friend about inapproriate behavior with my fiance?