My Fiancé's AP is... MY SISTER? The family fallout and my revenge. I (30 F) and my sister (31 F) have ALWAYS had such a good relationship so finding out about this one HURT. I felt like my heart was shattered. I’ve been with my fiancé since high school and we’ve always been with each other through every high and low, and we were only months away from getting married. I have no idea why on earth they did this to me. What’s even worse was that our mom knew and out of fear of getting involved...