I'm mad at my brother about how him and his wife plan there wedding guest list.
Are you mad some people aren't invited to the wedding of your brother and his fiance?
I'm mad at whole structure of the wedding.
It is their wedding, you need to be comfortable with what they are doing with it, even if you do not like it.
Fuck, I feel like disinviting my little brother to the wedding.
You have no control over the guest list, that is the job of your brother and his fiance. Just deal with the wedding as you can, your brother will appreciate you for it.