My future SIL had her daughter earlier year and despite how I told him I feel about it, her and my future MIL decided they were going to have her baptism the day after our wedding. I've had a lot of trouble with this because the future SIL likes to make things about her constantly (MIL is the same way). She ran off and got married and did whatever she wanted and I only feel it's right to allow us to do things the way we want. Not to mention, if this was the other way around, I'd be in the wrong for even thinking about doing something like this. I had already told them that a lot of my family will be in town that day and I was expecting to spend time with both of our families together - either do a beach day or a BBQ and have just a relaxing day with everyone hanging out and getting to know each other (as I'll be stressing up until that day). My fiance doesn't like the idea and thinks it's rude of them to do it but "has to go". I told him I'm not going because I'm tired of them getting their way like they always do, but I don't want to spend any part of our first day as husband and wife apart. He feels like I'm coming in between him and family even though I've made it clear from the beginning how I felt and they decided to have it that day regardless. I don't feel it's right of them to do this to their son on his first day married, especially since he said he doesn't feel it's right of them to do it and doesn't actually want to go but I'm at a loss as to what should be done.