Interest on Joint account, but parent is deceased

My mother had a joint checking account with my sister and me. Mom  passed away in 2018, however we have left the account open to pay expenses for her house, which we now co-own.  This year we received a 1099-INT for $11.37 which I need to claim, however, the SS# of record is my Mom's.  When/How in the tax form shall I submit this income?