At our wedding, our two families will meet for the first time due to living in separate states. Our families are extremely different. My fiancé's family is well off financially, culturally refined, and lives in the large city where our wedding will take place. My extended family is the exact opposite. My wedding will not be black tie due to the time of the day in which it will begin, but it will be very formal. It will also take place in a very formal ballroom. However, I have recently learned that in order for some members of my family to attend, due to their financial restrictions, I will have to pay for their wedding attire and possibly transportation to the location, although they are simply guests and not participants within the ceremony. I am willing to do this since it was my decision to have a formal wedding in a big city where my small town family members refuse to drive. Now I am faced with another problem. At least two of my close family members are potentially refusing to dress in formal attire. No, they're not requesting to wear khakis or dress slacks, they wish to wear jeans and a "nice" shirt. I'm not sure how to respond. I feel as if the differences between our families will be highlighted even more if they refuse to dress in the formal attire that my fiancé's family will surely adhere to. I also feel as if I'm spending hundreds of dollars on formal attire and transportation for my family members, they are being selfish by rebelling against the dress code so horribly. I'd even be ok with khakis and a button up, but JEANS at a formal wedding?! I've been told to tell my family if they will not dress properly, they will not be able to attend the wedding. I don't want to have five people sitting on my side of the aisle due to unsupportive family though. What can I do?