So....my sister is getting married this summer to her high school sweetheart of 10 years. They had a two year engagement and while planning this wedding have had many arguments and have learned more about each other’s flaws and how much of opposites they are from each other. Friends, family and everyone closest to her have agreed that they don’t see this marriage lasting forever. As a sister is it my obligation to tell her? Or should I just let it happen? I feel that it’s gone too far and shes too passive so she will never back out. Thoughts??