How can i find out if i have a life insurance policy?

So six years ago right before my grandmother passed. She called my wife and to her that I had a life insurance policy. my grandmother instructed my wife not to tell me about the policy be she didn't want me trying to cash it in say if we fell on hard times. of course, my wife told me about the conversation. to... show more So six years ago right before my grandmother passed. She called my wife and to her that I had a life insurance policy. my grandmother instructed my wife not to tell me about the policy be she didn't want me trying to cash it in say if we fell on hard times. of course, my wife told me about the conversation. to which I replied, "yeah that sounds about right" never thinking for a minute that my wife would pass before me. well, now everyone who knew about this policy is gone. I don't even know the provider. does anyone know if it is possible to find out?
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