Last year my parents got divorced. There was a bit of anger, but they generally stayed civil with each other. A few months ago, however, my dad began dating a women from our church, something they agreed neither would do. He figured that as she had been a family friend when he was a kid, it was OK. Thing is, she was also my moms friend, making this feel like a double betrayal. Though not understanding why what he did was wrong, he agreed to stop seeing her. A few weeks ago, my dad and her began to date again. While I am opting to forgive and forget, assuming that neither of them meant to heard my mom, my sister still dislikes her, and thinks she seems like a mean person. Two days ago, I mentioned to my mom how I feel like my sister thinks I'm either with her or against her, to which my mom had no advice. The next day, she seemed upset, and when I asked what the matter was, she told me she though I didn't believe she was right to be upset, that I was asking her to tell my sister she shouldn't feel my upset at dads girlfriend and that I like my dad more than her. I explained that the opposite was true, that I was trying to avoid taking sides, not siding against her. I apologized for sounding rude, but she is still upset, and I don't know what to. I cant talk to mom or dad about this, as they'd just get mad at each other, and I don't know who to do or who talk to.