AITA for no longer wanting to be in my sister's wedding after her request?

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The original was posted on /r/AmItheAsshole by /u/consequentialism_97 on 2023-10-07 08:39:20.

My [27F] little sister [24F] is getting married next summer and is in the midst of wedding planning.

As we're very very different and live on opposite coasts, I am not really involved in planning, but occasionally she will share something with me for a reaction/opinion.

Yesterday she booked her photographer and we were going over other people's online wedding photos together when she made an odd request.

She insisted we take photos in which my husband specifially does not appear, "just in case".

Not girls only, blood only, bridesmaids only- without him, in case we split. I checked.

I was honestly shocked and had to stop myself from suggesting we take photos without the groom then, since divorce seems such a likelihood these days, but it's completely put me off being there at all.

We have a child together, we're married, never said an unkind word to each other. I see no reason to imply we would ever separate.

Is this a sane ask? I've never been more than a simple wedding guest before so perhaps I am being an A?

TL,DR: Little sister asked we take photos for wedding album where my husband specifially doesn't appear, I don't want to go to the wedding.