My fiance and I have been together for about a year and a half now and engaged for a little over two months. We both have kids - my daughter is 9 and his son is 15. My daughter has a wonderful relationship with my fiance. I have a so so relationship with his son, which is to be expected because of gender and age. I have stayed out of the way when it comes to discipline and don't ask him to do much around the house. I leave all of the "dirty work" to his dad, however lately he has been very disrespectful to me and I've had to address it. Before we got engaged he told his dad he didn't like me. His dad acknowledged it but said this is about my happiness as well as yours and the reasons he didn't like me were very picky. This weekend the poo hit the fan. He told his dad he's been difficult and disrespectful in hopes that I would give up and leave his dad or that his dad would kick my daughter and I out. He told his dad he will not be in the wedding and he wont even go to the wedding. My fiance is devastated. A part of me is relieved because I have a bad feeling he would go out of his way to screw up parts of the wedding, but I also know how sad my fiance will be if he's not there. Do we make him stand up in the ceremony as his best man or do we let him skip out and not even go to the wedding?