Am I overreacting

I met a woman almost a year ago. She’s amazing in every aspect of life. We do have one hiccup though and maybe I’m overreacting or maybe not. I try my heart is not to be jealous, but I’m a man and I’m protective over what I love. That’s what I’ve been our first Christmas together she decided to spend it with her ex and her two kids up north because that’s what they’ve always known and that’s what they’re comfortable with. I know some of you will ask her kids are 17 and 20 . Almost every time her husband comes into town they take their son out to eat because that’s the life he’s comfortable with. They have been divorced a couple of years. When she goes out of town to visit her other son up north, she stays at his house in one of the spare bedrooms. Am I overreacting? Am I being jealous for no reason?