My fiancees brother is also his best man and wants to wear his dress blues in the ceremony. I asked him not to because I feel it would detract attention from us on our day, and i just prefer all the groomsmen match. He would be the only one dressed differently out of 4 groomsmen. My fiancee completely agrees with me.
However his family thinks that we should be honored to have him in dress blues and we are being selfish. Am i being unreasonable by asking that he dress like everyone else?