My son was owner of some Savings Bonds and his dad was co-owner. What happens if his dad took the Savings Bonds and cashed them without my son's signature? Can he do that? And what can I do to get his money back? Tom's response As far as the US Treasury is concerned, either co-owner of a Savings Bond can cash it without the knowledge or permission of the other co-owner. However, if there was an understanding between your son, his dad, and you that the bonds belonged to your son, you should discuss the situation with your lawyer. Click here to visit the premier independent web site for owners of United States Savings Bonds.