Property ownership dispute on a property 30 years old property

We have brought a land 30 years ago. The property was named with my mother and one of my uncle. We have paid him his share already 30 years ago but he said that he will transfer the ownership later. So we have built a house on the whole land. He has never lived here or even visited here. Now after the 30 years when we asked him to transfer the ownership he is asking for huge amount of money and saying to file a case. We have been living here in 30 years all the house tax, electricity bill we have been paying. What are my options here.