Does he owe 5k for this term or 5k for the whole school year?
if he owes 5k for this term, this school is not going to be affordable to your family. Even with the 4k additional unsub loan, it will be disbursed 2k for the fall term and 2k for the spring term. This means that you will have to come up with 3k this term and 3k next term to make this school happen.
can you afford the payment plan, which would be ~ 600/month plus fees? Student Payment Center l University of Pittsburgh
If it is 5k for the school year, after the loans you will need to come up with $1000 for the school year or $500 by the the 13th in order for him to attend classes.