A green card holder can sponsor a spouse and unmarried children, but stepchildren must meet specific age and timing requirements. The marriage must have occurred before you turned eighteen to qualify as a stepchild.

If you do not meet the stepchild definition, the marriage alone will not create a direct path for you. Other immigration options would need to be explored separately.

Your age and the date of the marriage are very important factors. Family-based categories are strict and do not allow exceptions easily. An immigration attorney can review your family timeline to confirm whether any sponsorship option exists.