Senior citizen tax related

To All

My Father is Pensioner. He was invest Rs.20000 in 5 years FD in bank and mature Amount is Rs.29192.(80C at the time of Deposit ) My father has joined Bank A/c with my mother ( 2nd holder )

1 - Interest on FD Rs.9192 ( 20000-29192 ) treat as income ?

2 - This Interest income declare in my father IT return or My mother IT retun or both 50 % ?