If the younger brother is in America and the younger sister wants to immigrate, can the husband and wife immigrate together?

The priority of American citizens applying for compatriot immigration is extremely low, and they have to wait 10 years or more.

When a person immigrates, spouses can apply together. After approval, both of them can immigrate. Immigration means getting a green card, being called a permanent resident of the United States, and being able to live and work in the United States for a long time. You don't have to live and work in America. If you don't live or work in America for a long time, your green card will be cancelled.