10 Can parents apply for married children in the United States?

Your parents can apply for a green card for your adult unmarried children. The immigration schedule is about eight years. You can't get married for eight years. If you get married, you lose your qualification.

Because you were not eligible to apply for an immigrant green card for adult married children, there was no application at that time and there was a time limit. The American green card is actually an American permanent resident card. After getting it, you can enjoy some welfare benefits and exercise your rights.