My Mom died. She had LTC Ins. with-return of premium benefit-I(son) the beneficiary. No Claims filed. Some of-return of premiums-was taxable. Who reports this income?

My mother passed away.  She Had a Long Term Care Insurance Policy with a "return of premium benefit".  I’m her son, the designated beneficiary on her LTC Policy, and the executor of her estate. No claims were ever filed under this policy.  I as the beneficiary received a Return of Premium totaling-$65,683.47.  Since my mother had deducted a portion of these premiums as medical expenses on Schedule A of her Form 1040s, $12,634.00 of the Return of Premiums is taxable.  My mother was the person who deducted these premiums as a medical expense deduction, not me.  How and where is this income reported, the estate's Form 1041, or my Form 1040?