dude i totally feel you. my brother got married in may and none of our family was in the wedding!! my now sister-in-law is a total bitch and she lies and is hypocritical about a lot of things. even with all of that you still want to be in the wedding because its your brother, and for me i just wanted my nieces in the wedding. the day of the wedding we finally convinced him to let our two little nieces give away the programs at the door.
i think you should wear a bright color dress with a big had and a sash that everone would love and goo after lol