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"They feel like they have been disrespected by us not inviting their children"
One of the most difficult aspects of wedding preparation is creating the guest list since, eventually, you'll have to pick who gets invited and who doesn't. Choosing to have an adult-only wedding and upholding that decision consistently is one of the simplest methods to reduce the number of guests you invite.
When couples conclude on having an adult-only wedding, they typically mean the reception. The location of the venue itself, the style, the theme, and all of the planned events are what the couples are focusing on.
You could be concerned that guests with children will take offense at being invited alone (which, of course, sometimes happens), but you'd be amazed at how many will actually relish the opportunity to spend a night out having their own fun. However, you must inform your guests if you decide to exclude anyone who doesn't fit your adult requirements.
The OP opted to make her wedding reception an adults-only event. This is because they are limited in capacity due to the venue and also like the idea of only celebrating the night with adults.
The OP also mentioned that the only child who will be attending the wedding is her brother's daughter. This has caused a huge argument in the family, to the point where some family members have stopped talking to the OP's parents and have said they aren’t coming to the wedding as they feel disrespected.
Many people do not like an invitation with conditions. Some people see weddings a certain way and don't really like child-free events.
But so long as the OP is polite about it and accepts the folks who won't come can make their own choices, Redditors considered her not to be the AH. Drop your thoughts about this story in the comments and share as well.