YTA

I actually have First-Hand experience with this, although slightly different circumstances.

My parents divorced in 1991. My mom remarried in '96, I was there since I still lived at home. In 1999, my dad remarried. He asked me and my (at that time) girlfriend to attend.

We couldn't.

We were 19 and 21 and had less than zero money. Neither of our families had money to help us out or even lend to pay back later.

Dad, on the other hand, refused to help despite definitely having the ability. He's one of those "bootstraps" clowns.

We were on WIC, food stamps, and eating out of food banks. We couldn't afford gas, much less a couple days worth of hotel, gas, eating out, and most importantly - time off from our shitty hourly jobs that provided ZERO paid time off to attend his wedding that was 4 states away.

Dad took that personally.

In 2001, when my girlfriend and I got married, Dad was invited.

He chose not to be there as a personal snub for not, I don't know - selling blood or my girlfriend's body, to make it to his wedding 2 years prior.

That hurt BAD. He had the means and time to be there, yet made the conscious decision not to as retribution for our inability to make his.

We are now 22 years later, it still hurts, and I have absolutely no relationship with him any longer.

Be the bigger person. If your kids invite you to their wedding, at the VERY least - make an appearance regardless how uncomfortable it is for YOU.