In some circumstances, the purchaser of the bonds names a beneficiary in the event of death. In that case, the named survivor can redeem the bonds at most financial institutions by providing adequate identification and proof of death. In your case, your father apparently purchased paper bonds that are in the possession of your stepmother. Without a named survivor, the bonds would be included in your father's estate and passed according to his will or by court action. Since your stepmother has possession, your best advice is to contact an attorney on the best way to proceed.