Answer:
(Fatwa: 1545/1237/L=1430)
If you are not sure that your father purchased the land with bribe money, you are not asked to give the amount in charity, but if you do the same as precautionary measure it is better.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
