How to prove of not selling a property without the consent of siblings

Hello sir, 15 years ago we brothers selled a property of dad(who passed away 20 yrs ago) for the sake of hajj for mother as she instructed to sell. Father wrote that some property is to be given for sisters, If not Rs. 10,000 . There is no money ,Hence property is selled and money from that property is given to sisters. After 15 yrs. My brother is booked a case saying you should hav given money instead of selling property. At the time of selling everyone agreed to sell the land and give money.After the death of mother, now they are telling lie that we don't know anything about it. I selled alone entire property.They booked a case, How should I have to prove Iam not guilty?