The mortgage insurance you are referring to is most likely the standard mortgage insurance that is on a loan above 80% of the value of the house. This MI covers the lender in case of the borrower defaulting on the loan. It does nothing to help the borrower.
If you are on the deed then you still own the house if your husband dies but if you cannot either refinance the mortgage or continue to pay the monthly payments then the lender will ultimately foreclose on the house and repossess it. What you need is a life insurance policy that will pay off the balance on the mortgage in case of the death of the mortgage holder.
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