My father recently has sold his flat and invested that all flat sold money for 5 years fix period in

My father recently has sold his flat and invested that all flat sold money for 5 years fix period in govt bonds for 20% property Tax saving purpose. And now he wants to give now only (before his death) that govt bonds invested money to only his one child out of 2 for some family reason. So kindly guide me by what procedure he can do so safely so in future other his child can't claim that money (for his share in it) in court ?