We're having a mid-sized destination wedding and I asked my future MIL for some names (mainly older people) for my fiance's side of the family that I am not too familiar with. She sent me names and addresses but included two of her step-daughters on the invite list. She recently got married and my fiance and I do not know them at all and frankly my fiance does not like the man his mother married, not to mention the fact his father passed away about 5 years ago, so he does not consider them family or even want them at the wedding. I haven't told this to my MIL, but when the invites go out and they are not on it I don't want this to be an awkward conversation. Basically what it comes down to is we don't want them at the wedding because it's an intimate destination wedding with close family and they are not it. What do I tell her if it comes up? Should I bring it up before invites go out???