Is OTHER wrong in the post ? POST : ... the kids in the wedding party.

I get it. It's their wedding, they can do what they want. But when they tell my kids they are going to be in the wedding party, but never approach the topic with my husband or I and then the invitations don't specify "no kids", is it unreasonable to assume that nieces and nephews are allowed to attend the reception? 

We only realized they possibly weren't invited the week before the wedding and called to double check and were told, "we asked if they wanted to be in the wedding party, so now it's too late and there is no room." Only they never asked. All the other siblings and their kids were asked, but not us and our kids.

And the next day we found out they called up all the baby sitters among our friends kids and invited them to wedding because they had extra seats.

We took the kids to the ceremony (because Catholic masses are open to anyone, not just some people), but didn't go to the reception at all considering it seemed obvious to us they were trying to make a statement. But am AITA for thinking they were jerks about it?

