This kind of thing is the most troublesome thing. If you hit Yuanyang, it is likely to lead to unpredictable consequences in the end, and this consequence is likely to make you regret it for life. So as far as my personal suggestion is concerned, you can stand in the position of your sister with your parents and then say what you really think, such as:

You are a girl. You haven't even got a relative there since you got married. If your husband loves you, then we can rest assured. But after marriage, it is inevitable that two people quarrel. If your parents-in-law didn't protect you at that time, who would you talk to about your psychological injustice? There are no relatives or friends there, and they can only swallow their teeth when they are wronged.

Parents must want their children to be around all the time. We don't agree that you want to marry in the northeast, but we will respect your decision. Come back to see us often if you have the ability in the future. If your family conditions are limited, call back more often. Your parents will inevitably be worried if you marry far away. We don't ask for anything, but please call back often to report your safety.