Inconsiderate brother-in-law and sister-in-law

Okay this will mostly be a rant to get everything out. But advice it appreciated too.

Around Christmas I got engaged to my boyfriend of 2 1/2 years. We were (and are) so excited and happy and in love and naturally started planning our wedding right away and set a date for early September. With Covid there has been a lot of ups and downs and uncertainty, but we get to still have our wedding almost how we originally planned.

In June my fiancé’s brother proposed to his girlfriend of about 8 months. Without discussing or mentioning it to us at all they decided they also wanted a September wedding. Which I was pretty annoyed by, but with the date they chose our wedding would have been over with and we would even have been back from our honeymoon by the so we decided to let it slide.

Then the fiancées bachelorette party gets planned for the weekend before our wedding. Again, super annoying but whatever, I just won’t go.

Now they have decided to change their wedding date to literally TWO DAYS after our wedding. They didn’t mention that they were considering changing it, or ask us how we’d feel. They weren’t even the ones to mention it to us! So now we can’t even attend (we planned to leave for our honeymoon that day before they even got engaged) which were super bummed about and all of their stuff bookends our wedding week. And we’ve been told that “we shouldn’t bring it up because we don’t want to ruin their wedding day” (lol what??). I’m generally a fairly chill person and have been a super relaxed bride. But this is a huge dick move and wildly inconsiderate, right?

Please tell me I’m not being crazy 😂