Rant about holidays between split households. Advice welcome

This is my year to have kids for Christmas but ex will not stop harassing me trying to get me to agree to let her have them.

I’m the primary custodian/ care giver. My ex wife is supposed to have them overnights for visitation every other weekend, but she ends up skipping out for one reason or another just about every time.

So in addition to my regular responsibilities as primary custodian Mon-Fri I also provide car more than half of the weekends.

Our custody agreement states that we each have the right to take kids for 2 weeks worth of vacation days out of town.

Our custody agreement also states that if there is a conflict regarding intended vacation days or holidays that I get preference in even years and she gets preference in odd years.

Last year she had kids for Christmas, and they came back sick so my kids ended up missing the party with my mom’s side and my dad’s side.

She tried telling me kids didn’t get to see her side of the family for Christmas last year, but that was a direct lie which I disproved via text messages from last year, proving they were with her from the 22nd to the 26th or so.

This year, I intend to keep them home for Christmas, as per my rights in the court agreement.

My ex keeps insisting that she’s going to take them anyway, and doesn’t seem to be taking no for an answer.

I want her to see them for visitation this weekend, since she has skipped out on so many weekends with them, but she’s made it clear that she intends to take them to visit her family out of state with or without my consent.

It doesn’t matter to her that the court agreement says I have preference, it doesn’t matter to her that she had the kids last Christmas….

What legal recourse do I have if have if she takes them in violation of our court agreement?

Do I call the police and report that as kidnapping or do I document and take her back to court?

She keeps trying to get me to agree to let her take them, because our court agreement says that if we’re in agreement then she can see them more than what it says on paper.

But I very explicitly do not agree in this case.

Part of my frustration is I want to do the right thing for kids and for her family and even for her. She keeps trying to guilt me by saying her grandma might not be alive next year and that this could be her last chance to see kids for a family photo.

It’s tugging at my heart because I really like her grandma a ton, but my grandma is older and hasn’t seen kiddos for several Christmasses in a row.

I know if I grant her the trip on my year she’s not going to return the favor next year and the result will be two more years of no kids for Christmas :(

Also, I told her she could take them after my holiday plans are over, but she doesn’t seem to accept this option.

God this is so fucking frustrating.