Is it normal to be jealous of your husband's sister?
It can be normal to feel jealous of your husband’s sister, especially if you feel left out or like she gets more of his attention. The feeling itself isn’t a problem; what matters is how you handle it.
Sibling closeness, family traditions, or your husband seeming to put his sister first can stir up jealousy—even when nobody’s doing anything wrong. It doesn’t mean you’re a bad partner, and it doesn’t automatically mean there’s anything romantic behind the feeling.
Try to pin down what’s bothering you: are you feeling excluded, compared, or like your needs come second? If so, talk to your husband about that specific feeling without asking him to choose between you. If the jealousy is taking over or causing repeated fights, it may help to look more closely at the family dynamic and what reassurance or boundaries you need.