Is it true that a brother doesn't want a sister if he has a wife?

No, just because a brother has a wife doesn't mean that he no longer cares about and loves his sister. The affection between family members will not change because of a person's marital status, especially the blood relationship.

In real life, the relationship between brother and sister is usually based on mutual care and support, and this relationship will not change because of brother's marriage. Of course, in the family, everyone's role and responsibility will be different, but this does not mean that family relations will weaken or disappear.

In marriage, husband and wife should respect each other, support each other, and maintain friendly relations with other family members. Therefore, brother and his wife should continue to care and cherish his sister, instead of alienating her because of marriage.