DEAR ABBY: My son is getting married next year. He and his future wife are extremely religious. My daughter (his sister) is also engaged — to a wonderful woman. Because of my daughter’s lesbian relationship, my son does not plan to invite his sister’s fiancee to the wedding, saying their values don’t align. (If he didn’t feel obligated, he wouldn’t invite his sister either.) I am devastated by this. This is disrespectful to my daughter and her fiancee. What are your thoughts?