My parents got divorced when I was 9 years old and my dad started dating someone when I was 11. They were together for 15 years, and broke up almost 3 years ago, but it is still an extremely sensitive subject. We were/are super close. My dad did not want me to invite her to my engagement party, (1.5 years ago), which she understood since it was still fresh and a smaller party, when I talked to her about it. I am now uneasy about what to do for my wedding. It is destination, so she could always use that excuse and she'd only know my family. But if I do invite her, I don't want my dad to be stressed the entire time since it is a special day for him too.