I don't know if the original poster has his own account or not. It is possible that the Dad took the check from a counter or something. Can this be clarified?
The real point here is that the scholarship was given to help pay for college. The Dad should have to pay back to the scholarship-granter the $1,000 given to the son, if it is not being used for the proper purpose.
If I were the son, I would actually call the police or legal aid to get advice on the legality of this action.
Is this Dad dangerous? How would he retaliate?
The son needs to get the $1,000 back asap and needs to send it directly to the college. That is what most colleges ask, and I believe the scholarship granters often want documentation that the money has been sent.
If the account is indeed joint, and still has at least $1,000 in it, then $1,000 could be sent to the colleges in lieu of the actual scholarship check. It can be sent as a money order, too. The Dad needs to cooperate with the son to do that asap, or there should be some consequence.
Just my opinion.
That scholarship money could have gone to someone else who would use it for the proper purpose. Most scholarships involve donations. This is a crime against those donors and the granting agency, and might be termed fraud.