IT RETURN OF DECEASED

Dear Sir,
My client filed Land Acquisition Reference against irrigation department for enhanced compensation for land acquired, but during pendency of the trial my client died and the enhanced compensation granted by court was awarded to his son. However while depositing the compensation amount to the court the irrigation dept deduct the tax at the rate of 10% and credited in the pan of late claimant (Father) in Mar 2018. Now 26 A of father showing TDS of 93802/- for AY 2018-19. In the course of time the Son by means of Registered will deed register himself as a legal heir of his father in income tax portal. Now my question is that to claim that refund whom ITR should I file? If I am filing fathers ITR what income should I show? Or What is the procedure to claim that Refund? The Father Son both are the farmers and don’t have any other source of income except Agriculture income.