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Do relatives of children born out of wedlock need to hire immigration lawyers to immigrate to the United States?

You can do it yourself, but if you can't read English, you'd better find someone to guide you. There are many visa organizations in China. You can search and see what America is like. Unmarried children of citizens under 2 1 year old are CR2/IR2, unmarried children over 2 1 year old are F 1, married children are F3, unmarried children of green card holders under 2 1 year old are F2A, and unmarried children over 2 1 year old are F2B.