DEAR ABBY: My younger sister and I were close growing up. We didn’t have many friends, but we were always willing to play games and have fun with each other. At one point, my sister said she wanted to marry me when we grew up. I didn’t think much of it because we were still kids, and I figured she didn’t know there were different types of love. As we grew older, we did make our own friends, and today I’m engaged to my longtime girlfriend. My sister and my fiancee got along great during the years we were still just “boyfriend and girlfriend,” but after we announced our engagement, my sister became hostile.