My parents divorced about 12 years ago because of another woman and my dad has now married that other woman. My parents get along alright, but my mom (understandably) does not care for my new stepmother. I also now have 2 stepsister (I was an only child) which I'm pretty excited about becuase they both want to help me do wedding stuff. This weekend I am going on my first dress shopping trip with my mom, stepmother and stepsister. I am really excited, but my mom is pretty pissed off that my stepmother is coming. She's the one that suggested the trip in the first place, so I can't very well say I don't want her to go anymore...but I really need my mom to be there for this really special trip. My mom has agreed to go and be civil, but she's really upset about the whole situation. She feels like she doesn't want to share this moment with my stepmother.How do I handle this situation? Do I just go and have fun and hope everything turns out well once we get there? I'd really appreciate an outside perspective on the whole thing. Thanks!