Hi and welcome to Just Answer!It would be the best - if you have a POA - Power of Attorney signed by your son - in this case - you would be able to deposit the check into your bank account.If you do not have POA - you may contact your son - and ask for that.If the check will expire - your son (or you with POA) may request another check from the IRS. The statute of limitation to claim a refund is three years - after that if not cashed - the money would be lost.
Would the prison give him a POA or do I get the form and send it to him?
You may use the general form - the issue is that his signature eon that form should be notarized. Most likely - there is a notary service in the prison - but you may contact the prison administration and verify.Here are some forms you may use - http://www.uslegalforms.com/powerofattorney/nebraskapoa.htmhttp://powerofattorneyform.com/PowerofAttorneyNebraska-PowerofAttorneyFormNE.htm