Taxation on Fixed Deposits interest

Hello, Have a question on Fixed deposits. My father FD is maturing soon. He has a few FDs maturing in 2019, some as early as jan, some in feburary, some march, july, and some September 2020. He is in the lowest tax bracket. The FD were mainly for 7 years and above. He will be getting around 9.5% return on the FDs. The total amount maturing in 2020 is about 1.25 crores. Is there any way i could reduce taxes for my father. Thanks