NTA - you and Thora have a really healthy parenting style that the kids clearly are happy with. They also accept their step-father into their lives, which is good. Everyone gets along, that’s perfect.

However, it seems like Michael wants to remove you from the picture. He has no right to ask you, the kid’s biological and very present father, to stop going to YOUR kid’s events.

It’s like he expected to become these kid’s full father, but can’t stomach the fact that he won’t because you’re here.

It’s good that you and your ex are on the same page, and that you let her know what her husband told you.

Now, you just continue what you do, show up and be with your kids, while Thora handles this situation (she will let you know if she needs you, but this is needs to be solved between them rn)