oops, I meant....
The real question is, do you love your brother?
I'm sure you do, we do not always like our family, but love them none the less. This is where it gets hard, Are you happy for him? What does it matter how HE has to jump through the hoops? You don't. But you can show him you care. If you go or not matters nothing. Acknowledging his milestone in his life may go unnoticed, but really it matters what you want to show him. If you want to show him that you'd rather eb 1st invited, then sure go that route. If you'd rather just show him you love him no matter how he treats you, then either send what you want to/a card/gift or go and bring your token of love and peace. Listen, I am giving advice that I myself would find hard to swallow, but it is what we as family should do out of love for our family. If it matters not, then don't sweat it.......but you wouldn't be asking if it didn't bother you.
Good day sir.