Are you on good terms with your ex-wife? If so, call her and ask if she knew anything about this. Perhaps you should also call your brother-in-law and ask him point blank what this is all about. See what he says.
It was fraudulent for him to take out a policy in your name and forge your signature on the policy, but as other attorneys have pointed out.....what are your damages? My concern would be whether he opened another policy after the one you discovered had lapsed. I'd ask the insurance company to add it to their SIU listing. If after talking to your brother-in-law you have concerns that he might wish to do harm to you, you should report it to the police.
This response is provided solely for informational purposes. It should not be construed as "legal advice" and does not create an attorney-client relationship.
What he did may be wrong, but what are your damages? The premiums were paid for and the policy is now cancelled so I am not sure how you were harmed in any way. The law does not allow compensation for possibilities or “may have” or “could have” type situations.
Why don’t you call your sister and see if she knows what was going on at that time?
DISCLAIMER: David J. McCormick is licensed to practice law in the State of Wisconsin and this answer is being provided for informational purposes only because the laws of your jurisdiction may differ. This answer based on general legal principles and is not intended for the purpose of providing specific legal advice or opinions. Under no circumstances does this answer constitute the establishment of an attorney-client relationship.
Fortunately, this matter ended. It leaves me with the impression that your wife's brother didn't think you adequately took care of his sister. If you haven't already, perhaps you should buy some life insurance so that others won't have to commit fraud to give her some modicum of protection.
The above response is general information ONLY and is not legal advice, does not form an attorney-client relationship, and should NOT be relied upon to take or refrain from taking any action. I am not your attorney. You should seek the advice of competent counsel before taking any action related to your inquiry.