Kid is in AOS, no matter his/her category is K2 derivative to your (K1) I-130 or a primary beneficiary of stepchild I-130.
It depends on the university to determine his/her Resident or non-resident tuition status. Remember, many US citizens are non-residents for this purpose.
It depends on the university to determine his/her Resident or non-resident tuition status. Remember, many US citizens are non-residents for this purpose.