First - let me say that this WAS a cute movie, but could have been SO MUCH MORE.
The title is a little misleading. The only thing about the 'sisters of the groom' is that they play matchmakers. The more prominent sisters are Sarah and Molly.
The story is more about the brother of the groom and his need for a date(because of his matchmaking sisters); there is a small storyline for one sister that just seems forced in - for really no reason. And why show what is going on in her life but not in the other sister's?
Like I said - it was cute (and it is ALWAYS nice to see Greg Evigan!!).