It is highly unlikely that your son will receive in state tuition at VT
http://admissions.vt.edu/admitted/residency.html
please read form which ask if both the student and the parent are Virginia residents (he is under 24 years old, he will not be a resident if you are not a resident of virginia for tuition purposes
http://admissions.vt.edu/content/dam/admissions_vt_edu/forms/IStuition.pdf