Can a child apply for a stepfather or stepmother to go to America?

According to the American immigration law, as long as the American citizen applicant is under 18 years old when his biological father or mother marries his stepmother or stepfather, he can apply for immigration for his biological mother and stepfather as well as his biological father and stepfather at the same time without waiting.

If the stepfather or stepmother and his ex-wife or ex-husband have children, they can also submit immigration applications for them according to the categories of brothers and sisters.

However, if the biological father or mother marries the stepmother or stepfather when the woman reaches the age of 18, she can only apply for the biological father or mother. After the biological parents immigrate to the United States and obtain a green card, they can submit immigration applications as permanent residents of the United States.