Having My Back

My cousin is getting married in a week and I just got the invitation. My entire extended family and immediate family are all invited to the ceremony and rehearsal dinner except me. I’m only invited to the reception. My aunt blames me for some issues in the past. I am not offended that I wasn’t invited, but a little hurt and disappointed in my siblings and parents for writing it off that it’s no big deal I wasn’t invited. Any advice on how to handle this would be great.