American immigrant temporary green card to formal green card.

You have a temporary green card and your mother has a permanent green card.

Everything is OK ~~

Couples also have separate tax returns, so it doesn't matter.

You are over 18 years old, and your stepfather is not qualified to participate in your affairs.

it's mainly your mother, if all her formalities are all right.

you can stay in the United States smoothly.

And you are an American college student ~

Definitely OK~~