So I need some advice, the attire for my wedding is going to be Semi Formal ceremony is late afternoon reception is in the evening, the groomsmen will be wearing dark grey suits and bridesmaids floor length satin dresses. My side of the family is much more proper or "worldly" then my fiances side of the family and will be wearing suits and ties and semi formal or cocktail type attire. I need advice because my soon to be MIL wants to dress casual and as well a soon to be brother in law who I believe should at least wear dress pants and a button down shirt. How do I go about this? I'm not picky but I would like them to be dressed semi-formal or close to it, especially because they will be in some pictures. I thought about requesting semi-formal attire on the invite or an insert card, is that tacky?