Am I the Asshole?

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The original was posted on /r/AmItheAsshole by /u/pr1ncessazula on 2023-06-26 16:58:28+00:00.

My (25 f) brother (20 M) is getting married to his fiancée (19 f) in two weeks, which we just found out over the weekend. They are getting married on her father's estate and the reception will be there as well. I don't really interact with his fiancée much but she seems nice and makes my brother happy, so good for them.

They let us know that the wedding would be childfree as well, which is entirely their choice, however as much as it hurts I don't think I am going to be attending. My daughter (2) has recently been diagnosed with epilepsy, which I have also dealt with most of my life so I know this gets worse before it gets better. We are going through tests, medication changes, etc...The venue is over 3 hours away and I am completely uncomfortable leaving her for that long.

I let my brother know this and he was hurt, and said that I am punishing them for having a childfree wedding, and they are entitled to do so. I said he is absolutely entitled to do so, but they gave little notice and he can't get mad when people put their children first, especially when they are dealing with medical issues. He said I should just get a sitter and I told him absolutely not, I am not comfortable doing that with everything going on. He said I was being an asshole and "sorry the world doesn't revolve around your kid"

My parents understand my decision, his fiancée thinks I am being a complete asshole as well. AITA?

ETA: Husband and I are still together, because of his job he will be away at the time of the wedding.