If your relative indicated they were divorced, make certain that you have searched for:

• Records of all local courts that may have heard a divorce case.
• Look for a separate maintenance case as well–there might have been no legal divorce, just a separation.
• Look for land records on the couple for any property they owned.
• Look for any property settlements (even of personal or chattel property) in the local land records.
• Consider the fact that the couple was not legally divorced.