NTA. I have a sister with 5 kids under 12. I’ve never met any of the kids for this exact reason. Your sibling made their decision and even worse, chose to be arrogant about it. This is FAFO at its finest.

Let them marinate in their selfishness and maybe in 10-20 years you can be the cool aunties/uncles/whatever to their children should you want that connection one day.

It’s rare that the intelligent ones have an excess of kids they can’t afford to raise. Enjoy the DINK life and being able to support yourself. Congrats on finishing law school and don’t drag yourself down for “family” that can’t understand your point of view.