How do two brothers treat their daughter as an outsider after they get married?

If your daughter had been married, she might have really become an outsider to your brother.

When your brother gets married, there will be another sister-in-law in your family, and your sister-in-law and your brother will form a small family, so for this small family, you are really an outsider, which is understandable.

After all, only your sister-in-law and your brother are family, in that small family.

But outside this small family, you and your parents, as well as your brother, are another family, and you are still a member of your family, so the so-called outsider is relative to whom.

But more and more girls will feel this way after getting married, because parents may have to please their sister-in-law to live happier.

Then I went back to my parents' house, feeling less carefree than before, and I couldn't communicate with my parents better, because there was another stranger at home, and this person had a high status at home.

So those married girls feel that their former home is not their own.