Mother got a green card in America. 2 1 year-old children can get a green card if they are unmarried?

Yes, you can apply for reunion immigration.

Differences between the children of close relatives of American citizens and unmarried children of American citizens in the priority of relatives' immigration and the differences in application procedures

According to the concept of American immigration law, close relatives of American citizens refer to their spouses, children and parents. Children of close relatives of American citizens must be unmarried under 2 1 year old. At present, close relatives of American citizens apply for immigration. Although there are places, the places are sufficient and there is no need to wait for a visa. The first priority for unmarried children of American citizens refers to unmarried children of American citizens over 2 1 year old. People who are married or over 2 1 year old are not allowed to be close relatives of American citizens. When applying for immigration to the United States, they must queue up to apply according to the priority category of immigrants.

The difference between children born of legal marriage and legal children in immigration law

Children born to unmarried people aged 2 1 after their parents are legally married, as long as they are children born to legal marriage, as long as they are under 2 1 when they first enter the country after their parents apply for immigration and their visas are approved, and they are unmarried, they can move to the United States with their parents. A legitimate child refers to a person who was born in a legal marriage but is over 2 1 year old or married. If such people want to apply for immigration to the United States, they should queue up to apply according to the priority immigration category. Therefore, if you want to move to the United States with your parents as a child, you must have two prerequisites. One is that you are under 2 1, and the other is that you are unmarried and indispensable.

It is recommended to consult professional immigration agencies for specific matters.